diff --git a/examples/OpenGLWindow/CMakeLists.txt b/examples/OpenGLWindow/CMakeLists.txt
index 35ea9ff3b..5ca71e1c8 100644
--- a/examples/OpenGLWindow/CMakeLists.txt
+++ b/examples/OpenGLWindow/CMakeLists.txt
@@ -49,6 +49,9 @@ ENDIF()
 
 IF(BUILD_EGL)
     SET(OpenGLWindow_SRCS ${OpenGLWindow_SRCS}  ${BULLET_PHYSICS_SOURCE_DIR}/examples/ThirdPartyLibs/glad/egl.c)
+    IF(APPLE)
+        ADD_DEFINITIONS(-D__APPLE__)
+    ENDIF(APPLE)
 ENDIF(BUILD_EGL)