diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 8f83aa4675..96b62bd4b6 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -14082,11 +14082,9 @@ ATExecAttachPartition(List **wqueue, Relation rel, PartitionCmd *cmd)
 	}
 
 	/*
-	 * Check whether default partition has a row that would fit the partition
-	 * being attached.
+	 * Check whether existing default partition has a row that would fit the
+	 * partition being attached.
 	 */
-	defaultPartOid =
-		get_default_oid_from_partdesc(RelationGetPartitionDesc(rel));
 	if (OidIsValid(defaultPartOid))
 	{
 		Relation	defaultrel;