diff --git a/include/wx/slider.h b/include/wx/slider.h
index 983d959ab6..6b27d841c9 100644
--- a/include/wx/slider.h
+++ b/include/wx/slider.h
@@ -100,6 +100,8 @@ public:
     #include "wx/gtk/slider.h"
 #elif defined(__WXMAC__)
     #include "wx/mac/slider.h"
+#elif defined(__WXCOCOA__)
+    #include "wx/cocoa/slider.h"
 #elif defined(__WXPM__)
     #include "wx/os2/slider.h"
 #endif