diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c
index 972fdbcb92f..5945559a1e3 100644
--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -7579,7 +7579,7 @@ index_delete_sort_cmp(TM_IndexDelete *deltid1, TM_IndexDelete *deltid2)
 			return (pos1 < pos2) ? -1 : 1;
 	}
 
-	pg_unreachable();
+	Assert(false);
 
 	return 0;
 }