diff --git a/app/Http/Requests/UpdateSubRange.php b/app/Http/Requests/UpdateSubRange.php
index aaeff91b..00f526e4 100644
--- a/app/Http/Requests/UpdateSubRange.php
+++ b/app/Http/Requests/UpdateSubRange.php
@@ -14,7 +14,7 @@ class UpdateSubRange extends StoreSubRange
         return \array_merge(parent::rules(), [
             'slug' => [
                 'required',
-                'unique:sub_ranges,slug,' . $this->id
+                'unique:sub_ranges,slug,' . $this->subrange->id
             ]
         ]);
     }