diff --git a/src/services/services.ts b/src/services/services.ts
index 7f8e2aa45d3..7092fd05f41 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -214,7 +214,7 @@ namespace ts {
             this.end = end;
             this.flags = NodeFlags.None;
             this.modifierFlagsCache = ModifierFlags.None;
-            this.transformFlags = undefined!; // TODO: GH#18217
+            this.transformFlags = TransformFlags.None;
             this.parent = undefined!;
         }