diff --git a/src/ci/docker/host-aarch64/aarch64-gnu-llvm-20/Dockerfile b/src/ci/docker/host-aarch64/aarch64-gnu-llvm-20/Dockerfile
index 095624d6fb714..5dbca7e7b675b 100644
--- a/src/ci/docker/host-aarch64/aarch64-gnu-llvm-20/Dockerfile
+++ b/src/ci/docker/host-aarch64/aarch64-gnu-llvm-20/Dockerfile
@@ -37,20 +37,19 @@ RUN sh /scripts/sccache.sh
 
 # We are disabling CI LLVM since this builder is intentionally using a host
 # LLVM, rather than the typical src/llvm-project LLVM.
-ENV NO_DOWNLOAD_CI_LLVM 1
-ENV EXTERNAL_LLVM 1
+ENV NO_DOWNLOAD_CI_LLVM="1"
+ENV EXTERNAL_LLVM="1"
 
 # Using llvm-link-shared due to libffi issues -- see #34486
-ENV RUST_CONFIGURE_ARGS \
-      --build=aarch64-unknown-linux-gnu \
+ENV RUST_CONFIGURE_ARGS="--build=aarch64-unknown-linux-gnu \
       --llvm-root=/usr/lib/llvm-20 \
       --enable-llvm-link-shared \
       --set rust.randomize-layout=true \
-      --set rust.thin-lto-import-instr-limit=10
+      --set rust.thin-lto-import-instr-limit=10"
 
 COPY scripts/shared.sh /scripts/
 
 COPY scripts/stage_2_test_set1.sh /scripts/
 COPY scripts/stage_2_test_set2.sh /scripts/
 
-ENV SCRIPT "Must specify DOCKER_SCRIPT for this image"
+ENV SCRIPT="Must specify DOCKER_SCRIPT for this image"
diff --git a/src/ci/docker/host-aarch64/aarch64-gnu/Dockerfile b/src/ci/docker/host-aarch64/aarch64-gnu/Dockerfile
index 4b61fd94a6cfa..87bfc0766fbd9 100644
--- a/src/ci/docker/host-aarch64/aarch64-gnu/Dockerfile
+++ b/src/ci/docker/host-aarch64/aarch64-gnu/Dockerfile
@@ -21,10 +21,9 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
 
-ENV RUST_CONFIGURE_ARGS \
- --build=aarch64-unknown-linux-gnu \
+ENV RUST_CONFIGURE_ARGS="--build=aarch64-unknown-linux-gnu \
  --enable-sanitizers \
  --enable-profiler \
- --enable-compiler-docs
-ENV SCRIPT python3 ../x.py --stage 2 test && \
-  python3 ../x.py --stage 2 test src/tools/cargo
+ --enable-compiler-docs"
+ENV SCRIPT="python3 ../x.py --stage 2 test && \
+  python3 ../x.py --stage 2 test src/tools/cargo"
diff --git a/src/ci/docker/host-aarch64/dist-aarch64-linux/Dockerfile b/src/ci/docker/host-aarch64/dist-aarch64-linux/Dockerfile
index 9691d4b099b3b..750cafaca0b2c 100644
--- a/src/ci/docker/host-aarch64/dist-aarch64-linux/Dockerfile
+++ b/src/ci/docker/host-aarch64/dist-aarch64-linux/Dockerfile
@@ -76,8 +76,7 @@ ENV HOSTS=aarch64-unknown-linux-gnu
 
 ENV CPATH=/usr/include/aarch64-linux-gnu/:$CPATH
 
-ENV RUST_CONFIGURE_ARGS \
-      --build=aarch64-unknown-linux-gnu \
+ENV RUST_CONFIGURE_ARGS="--build=aarch64-unknown-linux-gnu \
       --enable-full-tools \
       --enable-profiler \
       --enable-sanitizers \
@@ -93,12 +92,12 @@ ENV RUST_CONFIGURE_ARGS \
       --set rust.jemalloc \
       --set rust.bootstrap-override-lld=true \
       --set rust.lto=thin \
-      --set rust.codegen-units=1
+      --set rust.codegen-units=1"
 
-ENV SCRIPT python3 ../x.py build --set rust.debug=true opt-dist && \
+ENV SCRIPT="python3 ../x.py build --set rust.debug=true opt-dist && \
       ./build/$HOSTS/stage1-tools-bin/opt-dist linux-ci --  python3 ../x.py dist \
-      --host $HOSTS --target $HOSTS --include-default-paths build-manifest bootstrap enzyme
+      --host $HOSTS --target $HOSTS --include-default-paths build-manifest bootstrap enzyme"
 
 ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=clang
-ENV LIBCURL_NO_PKG_CONFIG 1
-ENV DIST_REQUIRE_ALL_TOOLS 1
+ENV LIBCURL_NO_PKG_CONFIG="1"
+ENV DIST_REQUIRE_ALL_TOOLS="1"