diff --git a/src/backend/distributed/metadata/node_metadata.c b/src/backend/distributed/metadata/node_metadata.c
index 6da08c02e..f1814c1eb 100644
--- a/src/backend/distributed/metadata/node_metadata.c
+++ b/src/backend/distributed/metadata/node_metadata.c
@@ -2026,9 +2026,16 @@ DeleteNodeRow(char *nodeName, int32 nodePort)
 
 	/*
 	 * simple_heap_delete() expects that the caller has at least an
-	 * AccessShareLock on replica identity index.
+	 * AccessShareLock on primary key index.
+	 *
+	 * XXX: This does not seem required, do we really need to acquire this lock?
+	 * Postgres doesn't acquire such locks on indexes before deleting catalog tuples.
+	 * Linking here the reasons we added this lock acquirement:
+	 * https://github.com/citusdata/citus/pull/2851#discussion_r306569462
+	 * https://github.com/citusdata/citus/pull/2855#discussion_r313628554
+	 * https://github.com/citusdata/citus/issues/1890
 	 */
-	Relation replicaIndex = index_open(RelationGetReplicaIndex(pgDistNode),
+	Relation replicaIndex = index_open(RelationGetPrimaryKeyIndex(pgDistNode),
 									   AccessShareLock);
 
 	ScanKeyInit(&scanKey[0], Anum_pg_dist_node_nodename,
diff --git a/src/backend/distributed/utils/colocation_utils.c b/src/backend/distributed/utils/colocation_utils.c
index fa698f88a..50722dd9a 100644
--- a/src/backend/distributed/utils/colocation_utils.c
+++ b/src/backend/distributed/utils/colocation_utils.c
@@ -1235,10 +1235,17 @@ DeleteColocationGroup(uint32 colocationId)
 	{
 		/*
 		 * simple_heap_delete() expects that the caller has at least an
-		 * AccessShareLock on replica identity index.
+		 * AccessShareLock on primary key index.
+		 *
+		 * XXX: This does not seem required, do we really need to acquire this lock?
+		 * Postgres doesn't acquire such locks on indexes before deleting catalog tuples.
+		 * Linking here the reasons we added this lock acquirement:
+		 * https://github.com/citusdata/citus/pull/2851#discussion_r306569462
+		 * https://github.com/citusdata/citus/pull/2855#discussion_r313628554
+		 * https://github.com/citusdata/citus/issues/1890
 		 */
 		Relation replicaIndex =
-			index_open(RelationGetReplicaIndex(pgDistColocation),
+			index_open(RelationGetPrimaryKeyIndex(pgDistColocation),
 					   AccessShareLock);
 		simple_heap_delete(pgDistColocation, &(heapTuple->t_self));