diff --git a/guacd/Dockerfile b/guacd/Dockerfile
index 5259acc..9242d96 100644
--- a/guacd/Dockerfile
+++ b/guacd/Dockerfile
@@ -5,4 +5,6 @@ LABEL MAINTAINER="helloworld1024@foxmail.com"
 COPY ./guacd/fonts/Menlo-Regular.ttf /usr/share/fonts/
 COPY ./guacd/fonts/SourceHanSansCN-Regular.otf /usr/share/fonts/
 
-RUN mkfontscale && mkfontdir && fc-cache
\ No newline at end of file
+user root
+
+RUN mkfontscale && mkfontdir && fc-cache