diff --git a/docker/backend/Dockerfile b/docker/backend/Dockerfile
index 205f1c149..9cc3ec5b7 100644
--- a/docker/backend/Dockerfile
+++ b/docker/backend/Dockerfile
@@ -9,7 +9,7 @@ RUN apt-get -y install llvm
 
 ENV LANG=en_US.UTF-8
 
-ENV PROJECT_DIR=/fradrive
+ARG PROJECT_DIR=/fradrive
 WORKDIR ${PROJECT_DIR}
 ENV HOME=${PROJECT_DIR}
 ENV STACK_ROOT=${PROJECT_DIR}/.stack
diff --git a/docker/frontend/Dockerfile b/docker/frontend/Dockerfile
index 58da8801c..a9137d0eb 100644
--- a/docker/frontend/Dockerfile
+++ b/docker/frontend/Dockerfile
@@ -17,7 +17,7 @@ ENV CHROME_BIN=chromium
 # RUN npm install -g n
 # RUN n 14.19.1
 
-ENV PROJECT_DIR=/fradrive
+ARG PROJECT_DIR=/fradrive
 WORKDIR ${PROJECT_DIR}
 ENV HOME=${PROJECT_DIR}