diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4a615e843..226511b52 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -323,6 +323,7 @@ include_directories("."
     ${Boost_INCLUDE_DIR}
     ${MyGUI_INCLUDE_DIRS}
     ${OPENAL_INCLUDE_DIR}
+    ${OPENGL_INCLUDE_DIR}
     ${BULLET_INCLUDE_DIRS}
 )