diff --git a/gst-libs/gst/gl/gpuprocess/gstglwindow_gpu_process.c b/gst-libs/gst/gl/gpuprocess/gstglwindow_gpu_process.c
index ffdbde996f..e1e8080a41 100644
--- a/gst-libs/gst/gl/gpuprocess/gstglwindow_gpu_process.c
+++ b/gst-libs/gst/gl/gpuprocess/gstglwindow_gpu_process.c
@@ -37,6 +37,7 @@ G_DEFINE_TYPE (GstGLWindowGPUProcess, gst_gl_window_gpu_process,
 
 struct _GstGLWindowGPUProcessPrivate
 {
+  int empty;
 };
 
 static void