diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index dcf14b9dc0..96375814a8 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -17350,7 +17350,7 @@ ATExecAttachPartition(List **wqueue, Relation rel, PartitionCmd *cmd,
 	 * If the parent itself is a partition, make sure to include its
 	 * constraint as well.
 	 */
-	partBoundConstraint = get_qual_from_partbound(attachrel, rel, cmd->bound);
+	partBoundConstraint = get_qual_from_partbound(rel, cmd->bound);
 	partConstraint = list_concat(partBoundConstraint,
 								 RelationGetPartitionQual(rel));
 
diff --git a/src/backend/partitioning/partbounds.c b/src/backend/partitioning/partbounds.c
index 38baaefcda..1ec141b9eb 100644
--- a/src/backend/partitioning/partbounds.c
+++ b/src/backend/partitioning/partbounds.c
@@ -246,8 +246,7 @@ static List *get_range_nulltest(PartitionKey key);
  *		expressions as partition constraint
  */
 List *
-get_qual_from_partbound(Relation rel, Relation parent,
-						PartitionBoundSpec *spec)
+get_qual_from_partbound(Relation parent, PartitionBoundSpec *spec)
 {
 	PartitionKey key = RelationGetPartitionKey(parent);
 	List	   *my_qual = NIL;
diff --git a/src/backend/utils/cache/partcache.c b/src/backend/utils/cache/partcache.c
index 21e60f0c5e..f2b4867886 100644
--- a/src/backend/utils/cache/partcache.c
+++ b/src/backend/utils/cache/partcache.c
@@ -376,7 +376,7 @@ generate_partition_qual(Relation rel)
 		bound = castNode(PartitionBoundSpec,
 						 stringToNode(TextDatumGetCString(boundDatum)));
 
-		my_qual = get_qual_from_partbound(rel, parent, bound);
+		my_qual = get_qual_from_partbound(parent, bound);
 	}
 
 	ReleaseSysCache(tuple);
diff --git a/src/include/partitioning/partbounds.h b/src/include/partitioning/partbounds.h
index ebf3ff1f49..2f00f9aa3d 100644
--- a/src/include/partitioning/partbounds.h
+++ b/src/include/partitioning/partbounds.h
@@ -85,7 +85,7 @@ extern int	get_hash_partition_greatest_modulus(PartitionBoundInfo b);
 extern uint64 compute_partition_hash_value(int partnatts, FmgrInfo *partsupfunc,
 										   Oid *partcollation,
 										   Datum *values, bool *isnull);
-extern List *get_qual_from_partbound(Relation rel, Relation parent,
+extern List *get_qual_from_partbound(Relation parent,
 									 PartitionBoundSpec *spec);
 extern PartitionBoundInfo partition_bounds_create(PartitionBoundSpec **boundspecs,
 												  int nparts, PartitionKey key, int **mapping);