diff --git a/src/kernel_services/ast_queries/file.ml b/src/kernel_services/ast_queries/file.ml
index 41907d8fed09bcd67353217a53d99fdf0484d884..8bdc821d652bdf22e95fcdc330084d1d1b8c8771 100644
--- a/src/kernel_services/ast_queries/file.ml
+++ b/src/kernel_services/ast_queries/file.ml
@@ -519,7 +519,7 @@ let build_cpp_cmd = function
     in
     let string_of_supp_args extra includes defines =
       Format.asprintf "%s%s%s"
-        (concat_strs ~pre:" -I" ~sep:" -I" includes)
+        (concat_strs ~pre:"-I" ~sep:" -I" includes)
         (concat_strs ~pre:" -D" ~sep:" -D" defines)
         (concat_strs ~pre:" " ~sep:" " extra)
     in
diff --git a/tests/syntax/oracle/cpp-command.0.res.oracle b/tests/syntax/oracle/cpp-command.0.res.oracle
index 52bfebffa2b2199998d087475431714d90ccffb9..f910fe5ece81818d84c0dab9a4af138213c8ffa8 100644
--- a/tests/syntax/oracle/cpp-command.0.res.oracle
+++ b/tests/syntax/oracle/cpp-command.0.res.oracle
@@ -1,2 +1,2 @@
 [kernel] Parsing tests/syntax/cpp-command.c (with preprocessing)
-[cpp-command.c cpp-command.c cpp-command.c cpp-command.c] [TMPDIR/FILE.i TMPDIR/FILE.i TMPDIR/FILE.i TMPDIR/FILE.i] [ -I./share/libc -D__FRAMAC__ -D__FC_MACHDEP_X86_32 -dD -nostdinc]
+[cpp-command.c cpp-command.c cpp-command.c cpp-command.c] [TMPDIR/FILE.i TMPDIR/FILE.i TMPDIR/FILE.i TMPDIR/FILE.i] [-I./share/libc -D__FRAMAC__ -D__FC_MACHDEP_X86_32 -dD -nostdinc]
diff --git a/tests/syntax/oracle/cpp-command.1.res.oracle b/tests/syntax/oracle/cpp-command.1.res.oracle
index 9fa845eca34510435741d8e8e4303e5969fb7434..4d07269a88da2aca64a17efaba30377dfd8fcaab 100644
--- a/tests/syntax/oracle/cpp-command.1.res.oracle
+++ b/tests/syntax/oracle/cpp-command.1.res.oracle
@@ -1,2 +1,2 @@
 [kernel] Parsing tests/syntax/cpp-command.c (with preprocessing)
-%1 = cpp-command.c %2 = TMPDIR/FILE.i %args =  -I./share/libc -D__FRAMAC__ -D__FC_MACHDEP_X86_32 -dD -nostdinc
+%1 = cpp-command.c %2 = TMPDIR/FILE.i %args = -I./share/libc -D__FRAMAC__ -D__FC_MACHDEP_X86_32 -dD -nostdinc
diff --git a/tests/syntax/oracle/cpp-command.4.res.oracle b/tests/syntax/oracle/cpp-command.4.res.oracle
index 2008e719f9d6ebf04f9f1ef71946c37a79d60f88..2f8d187fc5edca6bf9ef78bff98609317dc67759 100644
--- a/tests/syntax/oracle/cpp-command.4.res.oracle
+++ b/tests/syntax/oracle/cpp-command.4.res.oracle
@@ -1,2 +1,2 @@
 [kernel] Preprocessing command:
-  gcc -E -C -I.  -I./share/libc -D__FRAMAC__ -D__FC_MACHDEP_X86_32 -dD -nostdinc 'tests/syntax/cpp-command.c' -o 'TMPDIR/FILE.i'
+  gcc -E -C -I. -I./share/libc -D__FRAMAC__ -D__FC_MACHDEP_X86_32 -dD -nostdinc 'tests/syntax/cpp-command.c' -o 'TMPDIR/FILE.i'