diff --git a/src/backend/commands/copy.c b/src/backend/commands/copy.c
index 5d46c9889dd..00b64e53204 100644
--- a/src/backend/commands/copy.c
+++ b/src/backend/commands/copy.c
@@ -2744,7 +2744,8 @@ CopyFrom(CopyState cstate)
 					check_partition_constr = false;
 
 				/* Check the constraints of the tuple */
-				if (cstate->rel->rd_att->constr || check_partition_constr)
+				if (resultRelInfo->ri_RelationDesc->rd_att->constr ||
+					check_partition_constr)
 					ExecConstraints(resultRelInfo, slot, estate);
 
 				if (useHeapMultiInsert)