diff --git a/test/common-utils/devcontainer-ruby-zshrc/Dockerfile b/test/common-utils/devcontainer-ruby-zshrc/Dockerfile
index 484dc27b0..c5e7c69c4 100644
--- a/test/common-utils/devcontainer-ruby-zshrc/Dockerfile
+++ b/test/common-utils/devcontainer-ruby-zshrc/Dockerfile
@@ -1,5 +1,6 @@
 FROM mcr.microsoft.com/devcontainers/ruby:3.2
 
 USER vscode
-RUN echo 'eval "$(rbenv init -)"' >> /home/vscode/.zshrc
+ENV USER=vscode
+RUN echo 'eval "$(rbenv init -)"' >> /home/$USER/.zshrc