diff --git a/src/backend/optimizer/plan/createplan.c b/src/backend/optimizer/plan/createplan.c
index 71678d08dcc..6f1166b7039 100644
--- a/src/backend/optimizer/plan/createplan.c
+++ b/src/backend/optimizer/plan/createplan.c
@@ -761,6 +761,15 @@ use_physical_tlist(PlannerInfo *root, Path *path, int flags)
 	if (rel->reloptkind != RELOPT_BASEREL)
 		return false;
 
+	/*
+	 * Also, don't do it to a CustomPath; the premise that we're extracting
+	 * columns from a simple physical tuple is unlikely to hold for those.
+	 * (When it does make sense, the custom path creator can set up the path's
+	 * pathtarget that way.)
+	 */
+	if (IsA(path, CustomPath))
+		return false;
+
 	/*
 	 * Can't do it if any system columns or whole-row Vars are requested.
 	 * (This could possibly be fixed but would take some fragile assumptions