diff --git a/Dockerfile b/Dockerfile
index 66189a428c..25c13b6a3d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -37,4 +37,5 @@ ENV PATH=/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin:$PATH \
 
 # Install portable-ruby and tap homebrew/core.
 RUN HOMEBREW_NO_ANALYTICS=1 HOMEBREW_NO_AUTO_UPDATE=1 brew tap homebrew/core \
+	&& chown -R linuxbrew: /home/linuxbrew/.linuxbrew \
 	&& rm -rf ~/.cache
diff --git a/Dockerfile.test.yml b/Dockerfile.test.yml
index 4b930db2c6..c7aa56974c 100644
--- a/Dockerfile.test.yml
+++ b/Dockerfile.test.yml
@@ -1,3 +1,3 @@
 sut:
   build: .
-  command: env USER=root brew test-bot
+  command: "sudo -i -u linuxbrew /home/linuxbrew/.linuxbrew/bin/brew test-bot"