diff --git a/gst-libs/gst/gl/gstglwindow.h b/gst-libs/gst/gl/gstglwindow.h
index bd13417511..f12a3173b2 100644
--- a/gst-libs/gst/gl/gstglwindow.h
+++ b/gst-libs/gst/gl/gstglwindow.h
@@ -32,7 +32,7 @@ G_BEGIN_DECLS
 
 #define GST_GL_TYPE_WINDOW         (gst_gl_window_get_type())
 #define GST_GL_WINDOW(o)           (G_TYPE_CHECK_INSTANCE_CAST((o), GST_GL_TYPE_WINDOW, GstGLWindow))
-#define GST_GL_WINDOW_CLASS(k)     (G_TYPE_CHECK_CLASS((k), GST_GL_TYPE_WINDOW, GstGLWindowClass))
+#define GST_GL_WINDOW_CLASS(k)     (G_TYPE_CHECK_CLASS_CAST((k), GST_GL_TYPE_WINDOW, GstGLWindowClass))
 #define GST_GL_IS_WINDOW(o)        (G_TYPE_CHECK_INSTANCE_TYPE((o), GST_GL_TYPE_WINDOW))
 #define GST_GL_IS_WINDOW_CLASS(k)  (G_TYPE_CHECK_CLASS_TYPE((k), GST_GL_TYPE_WINDOW))
 #define GST_GL_WINDOW_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS((o), GST_GL_TYPE_WINDOW, GstGLWindowClass))