diff --git a/c_check b/c_check
index 66acf1cad..9dc237beb 100644
--- a/c_check
+++ b/c_check
@@ -205,7 +205,7 @@ $binformat    = bin64  if ($data =~ /BINARY_64/);
 $no_avx512= 0;
 if (($architecture eq "x86") || ($architecture eq "x86_64")) {
     $code = '"vbroadcastss -4 * 4(%rsi), %zmm2"';
-    print $tmpf "int main(void){ __asm__ volatile($code); }\n";
+    print $tmpf "#include <immintrin.h>\n\nint main(void){ __asm__ volatile($code); }\n";
     $args = " -march=skylake-avx512 -o $tmpf.o -x c $tmpf";
     my @cmd = ("$compiler_name $args >/dev/null 2>/dev/null");
     system(@cmd) == 0;