diff --git a/jquerymobile/jquerymobile.d.ts b/jquerymobile/jquerymobile.d.ts
index 48c6459e1e..56139b5ba9 100644
--- a/jquerymobile/jquerymobile.d.ts
+++ b/jquerymobile/jquerymobile.d.ts
@@ -307,7 +307,7 @@ interface JQueryMobilePath {
     isRelativeUrl(url: string): boolean;
     makeUrlAbsolute(relUrl: string, absUrl: string): string;
     parseLocation(): ParsedPath;
-    parseUrl(url): ParsedPath;
+    parseUrl(url: string): ParsedPath;
 }
 
 interface ParsedPath {