diff --git a/samples/opengl/isosurf/isosurf.cpp b/samples/opengl/isosurf/isosurf.cpp
index 1489b7f958..ad9a6273c5 100644
--- a/samples/opengl/isosurf/isosurf.cpp
+++ b/samples/opengl/isosurf/isosurf.cpp
@@ -28,7 +28,7 @@
 #include "wx/timer.h"
 #include "wx/glcanvas.h"
 
-#ifdef __WXMAC__
+#if defined(__WXMAC__) || defined(__WXCOCOA__)
 #   ifdef __DARWIN__
 #       include <OpenGL/gl.h>
 #       include <OpenGL/glu.h>