diff --git a/Resources/js/router.ts b/Resources/js/router.ts
index 1cf9492..c83bf98 100644
--- a/Resources/js/router.ts
+++ b/Resources/js/router.ts
@@ -1,5 +1,5 @@
 export interface RouteDefaults {
-  [index: string]: string | null;
+  [index: string]: string | number | null;
 }
 
 export interface RouteRequirements {
diff --git a/Resources/ts/router.d.ts b/Resources/ts/router.d.ts
index 400e219..7036ff2 100644
--- a/Resources/ts/router.d.ts
+++ b/Resources/ts/router.d.ts
@@ -1,5 +1,5 @@
 export interface RouteDefaults {
-    [index: string]: string | null;
+    [index: string]: string | number | null;
 }
 export interface RouteRequirements {
     [index: string]: string;