diff --git a/libweston/backend-drm/drm.c b/libweston/backend-drm/drm.c
index 94729d896..11936115b 100644
--- a/libweston/backend-drm/drm.c
+++ b/libweston/backend-drm/drm.c
@@ -391,13 +391,13 @@ drm_output_render(struct drm_output_state *state, pixman_region32_t *damage)
 
 	scanout_state->src_x = 0;
 	scanout_state->src_y = 0;
-	scanout_state->src_w = output->base.current_mode->width << 16;
-	scanout_state->src_h = output->base.current_mode->height << 16;
+	scanout_state->src_w = fb->width << 16;
+	scanout_state->src_h = fb->height << 16;
 
 	scanout_state->dest_x = 0;
 	scanout_state->dest_y = 0;
-	scanout_state->dest_w = scanout_state->src_w >> 16;
-	scanout_state->dest_h = scanout_state->src_h >> 16;
+	scanout_state->dest_w = output->base.current_mode->width;
+	scanout_state->dest_h = output->base.current_mode->height;
 
 	pixman_region32_copy(&scanout_state->damage, damage);
 	if (output->base.zoom.active) {