diff --git a/lib/api/groups.rb b/lib/api/groups.rb
index 9d8b8d737a9b06faf7a8d1589b9e57369d53fbda..f981ec0dbfe42377e15c20c697cafd605e16c2d5 100644
--- a/lib/api/groups.rb
+++ b/lib/api/groups.rb
@@ -30,7 +30,7 @@ module API
       # Example Request:
       #   POST /groups
       post do
-        authorize! :create_group, current_user
+        authorize! :create_group
         required_attributes! [:name, :path]
 
         attrs = attributes_for_keys [:name, :path, :description, :visibility_level]
diff --git a/lib/api/helpers.rb b/lib/api/helpers.rb
index fdb70af694d9b1037c3bc862e7d0a063176df403..6a20ba95a79a199e2ea2dd873bc5f8faa565fd2e 100644
--- a/lib/api/helpers.rb
+++ b/lib/api/helpers.rb
@@ -129,7 +129,7 @@ module API
       forbidden! unless current_user.is_admin?
     end
 
-    def authorize!(action, subject)
+    def authorize!(action, subject = nil)
       forbidden! unless can?(current_user, action, subject)
     end