diff --git a/src/types.ts b/src/types.ts
index ecfecd5b5f..695b415b26 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -653,6 +653,9 @@ export class Type {
         }
       }
     }
+    if (this == Type.auto) {
+      return "auto";
+    }
     return this.kindToString();
   }