diff --git a/types/wlr_output.c b/types/wlr_output.c
index 8accf7a5..41a3f794 100644
--- a/types/wlr_output.c
+++ b/types/wlr_output.c
@@ -259,6 +259,7 @@ static void output_fullscreen_surface_render(struct wlr_output *output,
 
 	glViewport(0, 0, output->width, output->height);
 	glClearColor(0, 0, 0, 0);
+	glClear(GL_COLOR_BUFFER_BIT);
 
 	if (!wlr_surface_has_buffer(surface)) {
 		return;