diff --git a/priv/templates/system.ex b/priv/templates/system.ex
index f5bf25d..9e2479d 100644
--- a/priv/templates/system.ex
+++ b/priv/templates/system.ex
@@ -6,5 +6,6 @@ defmodule <%= app_name %>.Systems.<%= system_name %> do
 
   def run do
     # System logic
+    :ok
   end
 end
diff --git a/test/mix/tasks/ecsx.gen.system_test.exs b/test/mix/tasks/ecsx.gen.system_test.exs
index efddc91..24e9b92 100644
--- a/test/mix/tasks/ecsx.gen.system_test.exs
+++ b/test/mix/tasks/ecsx.gen.system_test.exs
@@ -27,6 +27,7 @@ defmodule Mix.Tasks.Ecsx.Gen.SystemTest do
 
                  def run do
                    # System logic
+                   :ok
                  end
                end
                """