diff --git a/tests/oldquotas.c b/tests/oldquotas.c
index 54dc242248c..37d4e2d37c1 100644
--- a/tests/oldquotas.c
+++ b/tests/oldquotas.c
@@ -112,4 +112,4 @@ bool disk_quotas(const char *path, uint64_t *bsize, uint64_t *dfree,
 
 #endif /* HAVE_SYS_QUOTAS */
 
-int main() { return disk_quotas(NULL, NULL, NULL, NULL); }
+int main(void) { return disk_quotas(NULL, NULL, NULL, NULL); }
diff --git a/tests/summary.c b/tests/summary.c
index 87a64fd90ef..ea48975316e 100644
--- a/tests/summary.c
+++ b/tests/summary.c
@@ -2,7 +2,7 @@
 
 void exit(int);
 
-int main()
+int main(void)
 {
 #if !defined(HAVE_FCNTL_LOCK)
 #error "ERROR: No locking available. Running Samba would be unsafe"