diff --git a/Dockerfile b/Dockerfile
index 8a04adb..0c61ee9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -33,4 +33,4 @@ RUN apt-get update && apt-get install -y nodejs && \
 COPY . /app
 
 EXPOSE 3000
-CMD ["sh", "-c", "xvfb-run --server-args=\"-screen 0 ${WINDOW_WIDTH}x${WINDOW_HEIGHT}x24\" ./electron --disable-gpu src/server.js"]
+CMD ["sh", "-c", "[ -e /tmp/.X99-lock ] && rm /tmp/.X99-lock; xvfb-run -e /dev/stdout --server-args=\"-screen 0 ${WINDOW_WIDTH}x${WINDOW_HEIGHT}x24\" ./electron --disable-gpu src/server.js"]