diff --git src/ansi-c/library_check.sh src/ansi-c/library_check.sh
index bb362dc..3c64fba 100755
--- src/ansi-c/library_check.sh
+++ src/ansi-c/library_check.sh
@@ -10,8 +10,8 @@ for f in "$@"; do
     perl -p -i -e 's/(_mm_.fence)/s$1/' __libcheck.c
     perl -p -i -e 's/(__sync_)/s$1/' __libcheck.c
     perl -p -i -e 's/(__atomic_)/s$1/' __libcheck.c
-    "$CC" -std=gnu99 -E -include library/cprover.h -D__CPROVER_bool=_Bool -D__CPROVER_thread_local=__thread -DLIBRARY_CHECK -o __libcheck.i __libcheck.c
-    "$CC" -S -Wall -pedantic -Wextra -std=gnu99 __libcheck.i \
+    "$CC" -std=gnu99 -msse2 -E -include library/cprover.h -D__CPROVER_bool=_Bool -D__CPROVER_thread_local=__thread -DLIBRARY_CHECK -o __libcheck.i __libcheck.c
+    "$CC" -S -Wall -pedantic -Wextra -std=gnu99 -msse2 __libcheck.i \
       -o __libcheck.s -Wno-unused-label -Wno-unknown-pragmas
     ec="${?}"
     rm __libcheck.s __libcheck.i __libcheck.c