diff --git a/base/Dockerfile b/base/Dockerfile
index 3157538..3d1b1fd 100644
--- a/base/Dockerfile
+++ b/base/Dockerfile
@@ -9,7 +9,7 @@ RUN apt-get update && apt-get install -y \
     libnotify4 \
     libsecret-1-0 \
     libgbm1 \
-     xvfb \
+    xvfb \
     libasound2 \
     fonts-wqy-zenhei \
     gnutls-bin \