diff --git a/examples/example.cr b/examples/example.cr
index 63edfd3..fe1a96d 100644
--- a/examples/example.cr
+++ b/examples/example.cr
@@ -13,7 +13,7 @@ class MessageService < Service
   def initialize(@message : String, @delay : Int32, @times : Int32)
   end
 
-  def run(_unit : Unit) : Service::Unit?
+  def run(_unit : Service::Unit) : Service::Unit?
     puts @message
     @@i += 1
     Log.info { @@i }