diff --git a/odata-parser.d.ts b/odata-parser.d.ts
index 8a1648d..9ed0875 100644
--- a/odata-parser.d.ts
+++ b/odata-parser.d.ts
@@ -77,7 +77,8 @@ export interface ODataOptions {
 		| OrderByOption
 		| FormatOption
 		| number
-		| boolean;
+		| boolean
+		| undefined;
 }
 export interface ODataQuery extends ResourceOptions {
 	resource: any;
diff --git a/tsconfig.json b/tsconfig.json
index 1f3d0ff..5deea5e 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -12,7 +12,6 @@
 		"removeComments": true,
 		"sourceMap": true,
 		"declaration": true,
-		"skipLibCheck": true,
 		"outDir": "out",
 		"allowJs": true
 	},