diff --git a/lib/instance.lua b/lib/instance.lua
index 7a66c84..1ba3467 100644
--- a/lib/instance.lua
+++ b/lib/instance.lua
@@ -123,8 +123,6 @@ function Instance:addSystem(system, eventName, callback, enabled)
 
       if enabled then
          system:enabledCallback(callback or eventName)
-      else
-         system:disabledCallback(callback or eventName)
       end
    end