diff --git a/index.ts b/index.ts
index cd5ea08..f32a215 100644
--- a/index.ts
+++ b/index.ts
@@ -36,10 +36,10 @@ export type TypedPathWrapper<T, TPH extends TypedPathHandlers<Record<never, neve
         ? {
             (): TypedPathWrapper<RET, TPH>;
         } & {
-            [P in keyof RET]: TypedPathWrapper<RET[P], TPH>;
+            [P in keyof Required<RET>]: TypedPathWrapper<RET[P], TPH>;
         }
         : {
-            [P in keyof T]: TypedPathWrapper<T[P], TPH>;
+            [P in keyof Required<T>]: TypedPathWrapper<T[P], TPH>;
         }
     ) & TypedPathHandlers<TPH>;
 
diff --git a/tsconfig.json b/tsconfig.json
index d7bc2bf..11758ab 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -10,6 +10,7 @@
     },
     "compileOnSave": false,
     "files": [
-        "index.ts"
+        "index.ts",
+        "index.spec.ts"
     ]
 }
\ No newline at end of file