diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index 349d130..a10ec2d 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1551,7 +1551,7 @@ get_tables_to_cluster(MemoryContext cluster_context)
 	}
 	heap_endscan(scan);
 
-	relation_close(indRelation, AccessShareLock);
+	heap_close(indRelation, AccessShareLock);
 
 	return rvs;
 }