diff --git a/configure b/configure
index 03b8f3574..93c6cbec3 100755
--- a/configure
+++ b/configure
@@ -1274,11 +1274,11 @@ if test "$nptl" != "no" ; then
   cat > $TMPC <<EOF
 #include <sched.h>
 #include <linux/futex.h>
-void foo()
-{
+int main(void) {
 #if !defined(CLONE_SETTLS) || !defined(FUTEX_WAIT)
 #error bork
 #endif
+  return 0;
 }
 EOF