diff --git a/ui/src/d.ts/shims-ovdashboard.d.ts b/ui/src/d.ts/shims-ovdashboard.d.ts
index 62974b6..f10213a 100644
--- a/ui/src/d.ts/shims-ovdashboard.d.ts
+++ b/ui/src/d.ts/shims-ovdashboard.d.ts
@@ -1,7 +1,7 @@
 declare module 'vue/types/vue' {
   interface Vue {
     $ovdashboard: {
-      api_url: (endpoint: string) => string;
+      api_url: (endpoint?: string) => string;
     }
   }
 }
diff --git a/ui/src/plugins/ovdashboard.ts b/ui/src/plugins/ovdashboard.ts
index 86c03a9..a926b92 100644
--- a/ui/src/plugins/ovdashboard.ts
+++ b/ui/src/plugins/ovdashboard.ts
@@ -18,7 +18,7 @@ class OVDashboardPlugin {
     }
   }
 
-  public api_url(endpoint: string | undefined): string {
+  public api_url(endpoint?: string): string {
     if (endpoint === undefined)
       return this.api_baseurl;