diff --git a/tests/summary.c b/tests/summary.c
index bd0c1624306..27f7d4d0619 100644
--- a/tests/summary.c
+++ b/tests/summary.c
@@ -2,7 +2,7 @@
 
 void exit(int);
 
-main()
+int main()
 {
 #if !defined(HAVE_FCNTL_LOCK)
 	printf("ERROR: No locking available. Running Samba would be unsafe\n");