diff --git a/lib/orbit_category/categorizable.rb b/lib/orbit_category/categorizable.rb
index 1d23fba9..4670dce0 100644
--- a/lib/orbit_category/categorizable.rb
+++ b/lib/orbit_category/categorizable.rb
@@ -35,7 +35,7 @@ module OrbitCategory
       end
 
       def category_id=(id)
-        category = id
+        self.category = id
       end
 
       def disable?