diff --git a/Modules/CheckIncludeFile.c.in b/Modules/CheckIncludeFile.c.in
index 40441f15a..ddfbee8be 100644
--- a/Modules/CheckIncludeFile.c.in
+++ b/Modules/CheckIncludeFile.c.in
@@ -1,6 +1,13 @@
 #include <${CHECK_INCLUDE_FILE_VAR}>
 
+#ifdef __CLASSIC_C__
 int main()
 {
   return 0;
 }
+#else
+int main(void)
+{
+  return 0;
+}
+#endif