diff --git a/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/bts1398.1.res.oracle b/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/bts1398.1.res.oracle
index 73d3ac2b865191eaf0bab61e438854128a8e74b8..877d15f251ecc37cde876cc196034793d12306f1 100644
--- a/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/bts1398.1.res.oracle
+++ b/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/bts1398.1.res.oracle
@@ -18,7 +18,7 @@
   __e_acsl_internal_heap ∈ [--..--]
   __memory_size ∈ [--..--]
   __fc_stdout ∈ {{ NULL ; &S___fc_stdout }}
-  __fc_fopen[0..511] ∈ {0}
+  __fc_fopen[0..1] ∈ {0}
   _p__fc_fopen ∈ {{ &__fc_fopen }}
   S___fc_stdout[0]{.__fc_stdio_id; .__fc_maxsz; .__fc_writepos; .__fc_readpos; .__fc_is_a_socket; .mode} ∈
                [--..--]
diff --git a/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/bts1398.res.oracle b/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/bts1398.res.oracle
index 73d3ac2b865191eaf0bab61e438854128a8e74b8..877d15f251ecc37cde876cc196034793d12306f1 100644
--- a/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/bts1398.res.oracle
+++ b/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/bts1398.res.oracle
@@ -18,7 +18,7 @@
   __e_acsl_internal_heap ∈ [--..--]
   __memory_size ∈ [--..--]
   __fc_stdout ∈ {{ NULL ; &S___fc_stdout }}
-  __fc_fopen[0..511] ∈ {0}
+  __fc_fopen[0..1] ∈ {0}
   _p__fc_fopen ∈ {{ &__fc_fopen }}
   S___fc_stdout[0]{.__fc_stdio_id; .__fc_maxsz; .__fc_writepos; .__fc_readpos; .__fc_is_a_socket; .mode} ∈
                [--..--]
diff --git a/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_bts1398.c b/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_bts1398.c
index 7cbe7d91981b3b8f32b4307dd9e44fdbcd322c09..9866acdacf7365137e57b4ad742efa8eb9517266 100644
--- a/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_bts1398.c
+++ b/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_bts1398.c
@@ -82,7 +82,7 @@ predicate diffSize{L1, L2}(ℤ i) =
  */
 extern FILE *__fc_stdout;
 
-FILE __fc_fopen[512];
+FILE __fc_fopen[2];
 FILE const *_p__fc_fopen = (FILE const *)(__fc_fopen);
 /*@ assigns *__fc_stdout;
     assigns *__fc_stdout \from *(format+(..)); */
diff --git a/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_bts13982.c b/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_bts13982.c
index 7cbe7d91981b3b8f32b4307dd9e44fdbcd322c09..9866acdacf7365137e57b4ad742efa8eb9517266 100644
--- a/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_bts13982.c
+++ b/src/plugins/e-acsl/tests/e-acsl-runtime/oracle/gen_bts13982.c
@@ -82,7 +82,7 @@ predicate diffSize{L1, L2}(ℤ i) =
  */
 extern FILE *__fc_stdout;
 
-FILE __fc_fopen[512];
+FILE __fc_fopen[2];
 FILE const *_p__fc_fopen = (FILE const *)(__fc_fopen);
 /*@ assigns *__fc_stdout;
     assigns *__fc_stdout \from *(format+(..)); */