diff --git a/code/sdl/sdl_glimp.c b/code/sdl/sdl_glimp.c
index ff6235c5..4d8257fc 100644
--- a/code/sdl/sdl_glimp.c
+++ b/code/sdl/sdl_glimp.c
@@ -37,6 +37,7 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
 /* Just hack it for now. */
 #ifdef MACOS_X
+#include <OpenGL/OpenGL.h>
 typedef CGLContextObj QGLContext;
 #define GLimp_GetCurrentContext() CGLGetCurrentContext()
 #define GLimp_SetCurrentContext(ctx) CGLSetCurrentContext(ctx)