diff --git a/CMakeExternals/PatchVTK.cmake b/CMakeExternals/PatchVTK.cmake
index 4eb6989741..04f218bd06 100644
--- a/CMakeExternals/PatchVTK.cmake
+++ b/CMakeExternals/PatchVTK.cmake
@@ -1,5 +1,5 @@
-set(path "Rendering/OpenGL/vtkXOpenGLRenderWindow.cxx")
+set(path "Rendering/OpenGL/vtkOpenGL.h")
 file(STRINGS ${path} contents NEWLINE_CONSUME)
-string(REPLACE "//#define GLX_GLXEXT_LEGACY" "#define GLX_GLXEXT_LEGACY" contents ${contents})
+string(REPLACE "#define GL_GLEXT_LEGACY" "//#define GL_GLEXT_LEGACY" contents ${contents})
 set(CONTENTS ${contents})
 configure_file(${TEMPLATE_FILE} ${path} @ONLY)