diff --git a/backend/docker/Dockerfile b/backend/docker/Dockerfile
index c9c23ca15..6036030c3 100644
--- a/backend/docker/Dockerfile
+++ b/backend/docker/Dockerfile
@@ -16,7 +16,7 @@ FROM docker.io/node:19-alpine@sha256:667dc6ed8fc6623ccd21cb5fa355c90f848daaf5d6d
 RUN apk add --no-cache tini
 ENTRYPOINT ["tini", "--"]
 
-ENV YARN_CACHE_FOLDER /tmp/.yarn
+ENV YARN_CACHE_FOLDER=/tmp/.yarn
 
 ## Stage 1: Code with all dependencies
 FROM base as code-with-deps
diff --git a/frontend/docker/Dockerfile b/frontend/docker/Dockerfile
index 403333e5e..ac85547b7 100644
--- a/frontend/docker/Dockerfile
+++ b/frontend/docker/Dockerfile
@@ -15,7 +15,7 @@ ENV NODE_ENV=production
 ENV NEXT_TELEMETRY_DISABLED=1
 ARG BUILD_VERSION=CLIENT_VERSION_MISSING
 
-ENV YARN_CACHE_FOLDER /tmp/.yarn
+ENV YARN_CACHE_FOLDER=/tmp/.yarn
 USER node
 WORKDIR /usr/src/app