diff --git a/misc/cgo/testcarchive/testdata/main7.c b/misc/cgo/testcarchive/testdata/main7.c
index 3d101094d5..2c6d98daa8 100644
--- a/misc/cgo/testcarchive/testdata/main7.c
+++ b/misc/cgo/testcarchive/testdata/main7.c
@@ -14,4 +14,5 @@ int main() {
 	for (i = 0; i < 100000; i++) {
 		GoFunction7();
 	}
+	return 0;
 }