diff --git a/libraries/esp8266/examples/CallBackList/CallBackGeneric.ino b/libraries/esp8266/examples/CallBackList/CallBackGeneric.ino
index 381d8e0039..e77b35ef66 100644
--- a/libraries/esp8266/examples/CallBackList/CallBackGeneric.ino
+++ b/libraries/esp8266/examples/CallBackList/CallBackGeneric.ino
@@ -6,7 +6,7 @@ using namespace experimental::CBListImplentation;
 
 class exampleClass {
 public:
-  exampleClass() {};
+  exampleClass(){};
 
   using exCallBack = std::function<void(int)>;
   using exHandler = CallBackList<exCallBack>::CallBackHandler;