diff --git a/configure b/configure
index 79a748509..9143bb996 100755
--- a/configure
+++ b/configure
@@ -17701,7 +17701,7 @@ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
     #include <emmintrin.h>
-    main() { __m128i n = _mm_set1_epi8(42); }
+    int main() { __m128i n = _mm_set1_epi8(42); }
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
   ac_compiler_supports_sse2=yes