diff --git a/src/kernel_internals/typing/populate_spec.ml b/src/kernel_internals/typing/populate_spec.ml
index 8b762b1b8b4bd5251fadd139b4b67e768523a3dd..e9773fec250244714e8c02dfeaca029a662e3cef 100644
--- a/src/kernel_internals/typing/populate_spec.ml
+++ b/src/kernel_internals/typing/populate_spec.ml
@@ -155,7 +155,7 @@ struct
       else if not warned && not empty then
         Kernel.warning ~once:true ~current:true ~wkey:Kernel.wkey_missing_spec
           "Missing %s in specification of prototype %a,@, \
-           generating default specification, see -generated-spec-* options\
+           generating default specification, see -generated-spec-* options \
            for more info"
           name Kernel_function.pretty kf
 
diff --git a/tests/spec/oracle/default_spec_combine.1.res.oracle b/tests/spec/oracle/default_spec_combine.1.res.oracle
index 6642232481614e00ebe9ac2e1799d3546385d371..2d5b9acc3fbb8171dd013c06da9e4b2251ba2627 100644
--- a/tests/spec/oracle/default_spec_combine.1.res.oracle
+++ b/tests/spec/oracle/default_spec_combine.1.res.oracle
@@ -5,34 +5,34 @@ Registering an mode that does nothing
    generating default specification from complete behaviors
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing requires in specification of prototype f1,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing terminates in specification of prototype f1,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing assigns in default behavior of prototype f2,
    generating default specification from complete behaviors
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing requires in specification of prototype f2,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing terminates in specification of prototype f2,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing requires in default behavior of prototype f3,
    generating default specification from complete behaviors
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing terminates in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing requires in specification of prototype f4,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing allocates in default behavior of prototype f4,
    generating default specification from complete behaviors
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing terminates in specification of prototype f4,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 /* Generated by Frama-C */
 /*@
 axiomatic a {
diff --git a/tests/spec/oracle/default_spec_combine.2.res.oracle b/tests/spec/oracle/default_spec_combine.2.res.oracle
index b0fba331947e80c310d01431737b1394842bf6b4..d3b8b07f176f95c16f9d25b6e35b8d749f43c3c6 100644
--- a/tests/spec/oracle/default_spec_combine.2.res.oracle
+++ b/tests/spec/oracle/default_spec_combine.2.res.oracle
@@ -5,52 +5,52 @@ Registering an mode that does nothing
    generating default specification from complete behaviors
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing assigns in specification of prototype f1,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing allocates in specification of prototype f1,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing terminates in specification of prototype f1,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing exits in specification of prototype f2,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing assigns in default behavior of prototype f2,
    generating default specification from complete behaviors
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing allocates in specification of prototype f2,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing terminates in specification of prototype f2,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing exits in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing assigns in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing requires in default behavior of prototype f3,
    generating default specification from complete behaviors
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing allocates in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing terminates in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing exits in specification of prototype f4,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing assigns in specification of prototype f4,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing allocates in default behavior of prototype f4,
    generating default specification from complete behaviors
 [kernel:annot:missing-spec] default_spec_combine.i:53: Warning: 
   Missing terminates in specification of prototype f4,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 /* Generated by Frama-C */
 /*@
 axiomatic a {
diff --git a/tests/spec/oracle/default_spec_mode.2.res.oracle b/tests/spec/oracle/default_spec_mode.2.res.oracle
index 5fd4480bc341b773b4dfa2f5188a1f4c7386387d..281c87b8e9f19209107e14fbbebbee96f1a6a3af 100644
--- a/tests/spec/oracle/default_spec_mode.2.res.oracle
+++ b/tests/spec/oracle/default_spec_mode.2.res.oracle
@@ -1,13 +1,13 @@
 [kernel] Parsing default_spec_mode.i (no preprocessing)
 [kernel:annot:missing-spec] default_spec_mode.i:31: Warning: 
   Missing exits in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_mode.i:31: Warning: 
   Missing allocates in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_mode.i:31: Warning: 
   Missing terminates in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 /* Generated by Frama-C */
 void f1(void);
 
diff --git a/tests/spec/oracle/default_spec_mode.3.res.oracle b/tests/spec/oracle/default_spec_mode.3.res.oracle
index c1e4d4686a93cbb76abfbe8478c774c40715e370..4793b616e3f74d3bb94df64927efb5c3bac299c1 100644
--- a/tests/spec/oracle/default_spec_mode.3.res.oracle
+++ b/tests/spec/oracle/default_spec_mode.3.res.oracle
@@ -1,7 +1,7 @@
 [kernel] Parsing default_spec_mode.i (no preprocessing)
 [kernel:annot:missing-spec] default_spec_mode.i:31: Warning: 
   Missing terminates in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 /* Generated by Frama-C */
 void f1(void);
 
diff --git a/tests/spec/oracle/default_spec_mode.4.res.oracle b/tests/spec/oracle/default_spec_mode.4.res.oracle
index 95cfe9b579c66443b66d5d688add17ab26c1ff26..86d3a6b91f8ea103b72ddada30792e648361057b 100644
--- a/tests/spec/oracle/default_spec_mode.4.res.oracle
+++ b/tests/spec/oracle/default_spec_mode.4.res.oracle
@@ -1,16 +1,16 @@
 [kernel] Parsing default_spec_mode.i (no preprocessing)
 [kernel:annot:missing-spec] default_spec_mode.i:31: Warning: 
   Missing exits in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_mode.i:31: Warning: 
   Missing assigns in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_mode.i:31: Warning: 
   Missing allocates in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_mode.i:31: Warning: 
   Missing terminates in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 /* Generated by Frama-C */
 void f1(void);
 
diff --git a/tests/spec/oracle/default_spec_mode.5.res.oracle b/tests/spec/oracle/default_spec_mode.5.res.oracle
index df3257a887108e95c937dbb703de33985b63c046..319e013e53fab12b1416810d7531dcc92c5b294a 100644
--- a/tests/spec/oracle/default_spec_mode.5.res.oracle
+++ b/tests/spec/oracle/default_spec_mode.5.res.oracle
@@ -1,13 +1,13 @@
 [kernel] Parsing default_spec_mode.i (no preprocessing)
 [kernel:annot:missing-spec] default_spec_mode.i:31: Warning: 
   Missing exits in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_mode.i:31: Warning: 
   Missing assigns in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 [kernel:annot:missing-spec] default_spec_mode.i:31: Warning: 
   Missing terminates in specification of prototype f3,
-   generating default specification, see -generated-spec-* optionsfor more info
+   generating default specification, see -generated-spec-* options for more info
 /* Generated by Frama-C */
 void f1(void);