diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index 6276520860..90e02aecac 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -5771,13 +5771,12 @@ ReorderBufferFilterByRelFileLocator(ReorderBuffer *rb, TransactionId xid,
 	{
 		if (IsToastRelation(relation))
 		{
-			Oid     real_reloid = InvalidOid;
 			char   *toast_name = RelationGetRelationName(relation);
-			/* pg_toast_ len is 9 */
-			char   *start_ch = &toast_name[9];
+			int		n PG_USED_FOR_ASSERTS_ONLY;
 
-			real_reloid = pg_strtoint32(start_ch);
-			entry->relid = real_reloid;
+			n = sscanf(toast_name, "pg_toast_%u", &entry->relid);
+
+			Assert(n == 1);
 		}
 		else
 			entry->relid = RelationGetRelid(relation);