diff --git a/Dockerfile b/Dockerfile
index b2816ec..2aece79 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@
 FROM debian:bookworm-slim AS base
 
 RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections
-ENV DEBIAN_FRONTEND="noninteractive"
+ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get -qq update
 RUN apt-get -qq install --no-install-recommends \
     bc \
@@ -41,10 +41,10 @@ WORKDIR "$DOTFILES_DIR"
 #
 FROM source AS install
 
-ENV USER="test-user"
-ENV SKIP_SUDO_CHECK="true"
-ENV SKIP_SSH_CONFIG="true"
-ENV SKIP_DOCKER_CONFIG="true"
+ENV USER=test-user
+ENV SKIP_SUDO_CHECK=true
+ENV SKIP_SSH_CONFIG=true
+ENV SKIP_DOCKER_CONFIG=true
 
 USER test-user
 ARG UUID="docker"