diff --git a/rootston/output.c b/rootston/output.c
index e07cd9359..faa808d17 100644
--- a/rootston/output.c
+++ b/rootston/output.c
@@ -458,7 +458,7 @@ static void render_output(struct roots_output *output) {
 	}
 
 	if (server->config->debug_damage_tracking) {
-		wlr_renderer_clear(renderer, (float[]){1, 1, 0, 0});
+		wlr_renderer_clear(renderer, (float[]){1, 1, 0, 1});
 	}
 
 	int nrects;
diff --git a/types/wlr_output.c b/types/wlr_output.c
index a0f27e513..a5a6d0ebc 100644
--- a/types/wlr_output.c
+++ b/types/wlr_output.c
@@ -368,7 +368,7 @@ static void output_fullscreen_surface_render(struct wlr_output *output,
 	assert(renderer);
 
 	if (!wlr_surface_has_buffer(surface)) {
-		wlr_renderer_clear(renderer, (float[]){0, 0, 0, 0});
+		wlr_renderer_clear(renderer, (float[]){0, 0, 0, 1});
 		return;
 	}
 
@@ -385,8 +385,9 @@ static void output_fullscreen_surface_render(struct wlr_output *output,
 	pixman_box32_t *rects = pixman_region32_rectangles(damage, &nrects);
 	for (int i = 0; i < nrects; ++i) {
 		output_scissor(output, &rects[i]);
-		wlr_renderer_clear(renderer, (float[]){0, 0, 0, 0});
-		wlr_render_texture_with_matrix(surface->renderer, surface->texture, matrix, 1.0f);
+		wlr_renderer_clear(renderer, (float[]){0, 0, 0, 1});
+		wlr_render_texture_with_matrix(surface->renderer, surface->texture,
+			matrix, 1.0f);
 	}
 	wlr_renderer_scissor(renderer, NULL);