diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c
index 146298828d8..3ada379f8bc 100644
--- a/src/backend/optimizer/path/allpaths.c
+++ b/src/backend/optimizer/path/allpaths.c
@@ -1383,7 +1383,7 @@ add_paths_to_append_rel(PlannerInfo *root, RelOptInfo *rel,
 	List	   *pa_partial_subpaths = NIL;
 	List	   *pa_nonpartial_subpaths = NIL;
 	bool		partial_subpaths_valid = true;
-	bool		pa_subpaths_valid = enable_parallel_append;
+	bool		pa_subpaths_valid;
 	List	   *all_child_pathkeys = NIL;
 	List	   *all_child_outers = NIL;
 	ListCell   *l;
@@ -1391,6 +1391,9 @@ add_paths_to_append_rel(PlannerInfo *root, RelOptInfo *rel,
 	bool		build_partitioned_rels = false;
 	double		partial_rows = -1;
 
+	/* If appropriate, consider parallel append */
+	pa_subpaths_valid = enable_parallel_append && rel->consider_parallel;
+
 	/*
 	 * AppendPath generated for partitioned tables must record the RT indexes
 	 * of partitioned tables that are direct or indirect children of this