diff --git a/src/backend/storage/smgr/smgr.c b/src/backend/storage/smgr/smgr.c
index 8310f73212..f291ded795 100644
--- a/src/backend/storage/smgr/smgr.c
+++ b/src/backend/storage/smgr/smgr.c
@@ -147,18 +147,19 @@ static inline uint32
 relfilenodebackend_hash(RelFileNodeBackend *rnode)
 {
 	uint32		hashkey;
+	uint32		hashkey2;
 
 	hashkey = murmurhash32((uint32) rnode->node.spcNode);
 
 	/* rotate hashkey left 1 bit at each step */
-	hashkey = pg_rotate_left32(hashkey, 1);
-	hashkey ^= murmurhash32((uint32) rnode->node.dbNode);
+	hashkey2 = murmurhash32((uint32) rnode->node.dbNode);
+	hashkey = hash_combine(hashkey, hashkey2);
 
-	hashkey = pg_rotate_left32(hashkey, 1);
-	hashkey ^= murmurhash32((uint32) rnode->node.relNode);
+	hashkey2 = murmurhash32((uint32) rnode->node.relNode);
+	hashkey = hash_combine(hashkey, hashkey2);
 
-	hashkey = pg_rotate_left32(hashkey, 1);
-	hashkey ^= murmurhash32((uint32) rnode->backend);
+	hashkey2 = murmurhash32((uint32) rnode->backend);
+	hashkey = hash_combine(hashkey, hashkey2);
 
 	return hashkey;
 }