diff --git a/CMakeLists.txt b/CMakeLists.txt
index 68961fa8..085c9e47 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,7 +34,6 @@ ENDIF()
 add_definitions(-DMATH_USE_OPENGL)
 add_definitions(-DMATH_RIGHTHANDED_CAMERA)
 add_definitions(-DMATH_AVX)
-add_definitions(-DGLFW_INCLUDE_VULKAN)
 
 SET(ULRE    ULRE.Base
             ULRE.Util