diff --git a/src/backend/commands/indexcmds.c b/src/backend/commands/indexcmds.c
index 75008eebde..f5b3c53a83 100644
--- a/src/backend/commands/indexcmds.c
+++ b/src/backend/commands/indexcmds.c
@@ -2864,7 +2864,7 @@ reindex_partitions(Oid relid, int options, bool concurrent,
  
                 /* Save partition OID */
                 old_context = MemoryContextSwitchTo(reindex_context);
-               partitions = lappend_oid(partitions, partoid);
+               partitions = lappend_oid(partitions, parentoid);
                 MemoryContextSwitchTo(old_context);
         }