diff --git a/src/canvas-drm.cpp b/src/canvas-drm.cpp
index 5513849..596d03d 100644
--- a/src/canvas-drm.cpp
+++ b/src/canvas-drm.cpp
@@ -476,6 +476,7 @@
 
     // Attempt to flip to the first rendered buffer in the queue.
     if (current_front_buffer_index_ < 0) {
+        glFlush();
         ret = drmModePageFlip(fd_, kms_.encoder->crtc_id,
                               kms_.fb_ids[rendered_buffers_.front()],
                               DRM_MODE_PAGE_FLIP_EVENT, this);