diff --git a/src/backend/storage/lmgr/spin.c b/src/backend/storage/lmgr/spin.c
index 6d59a7f15d..da9cc0d8c9 100644
--- a/src/backend/storage/lmgr/spin.c
+++ b/src/backend/storage/lmgr/spin.c
@@ -106,7 +106,7 @@ SpinlockSemaInit(void)
 void
 s_init_lock_sema(volatile slock_t *lock, bool nested)
 {
-	static int	counter = 0;
+	static uint32 counter = 0;
 
 	*lock = ((++counter) % NUM_SPINLOCK_SEMAPHORES) + 1;
 }