diff --git a/src/cocoa/spinbutt.mm b/src/cocoa/spinbutt.mm
index 26e6ae1441..ff0c9d11bf 100644
--- a/src/cocoa/spinbutt.mm
+++ b/src/cocoa/spinbutt.mm
@@ -17,6 +17,8 @@
 
 #import <AppKit/NSStepper.h>
 
+IMPLEMENT_DYNAMIC_CLASS(wxSpinEvent, wxNotifyEvent)
+
 IMPLEMENT_DYNAMIC_CLASS(wxSpinButton, wxControl)
 BEGIN_EVENT_TABLE(wxSpinButton, wxSpinButtonBase)
 END_EVENT_TABLE()