diff --git a/libkwineffects/kwingltexture.cpp b/libkwineffects/kwingltexture.cpp
index a27719332a..5f84dd6186 100644
--- a/libkwineffects/kwingltexture.cpp
+++ b/libkwineffects/kwingltexture.cpp
@@ -318,7 +318,7 @@ void GLTexturePrivate::cleanup()
 bool GLTexture::isNull() const
 {
     Q_D(const GLTexture);
-    return None == d->m_texture;
+    return GL_NONE == d->m_texture;
 }
 
 QSize GLTexture::size() const