diff --git a/src/ci/docker/host-aarch64/aarch64-gnu-debug/Dockerfile b/src/ci/docker/host-aarch64/aarch64-gnu-debug/Dockerfile
index 04b46226acfa4..7bc91243a5e2f 100644
--- a/src/ci/docker/host-aarch64/aarch64-gnu-debug/Dockerfile
+++ b/src/ci/docker/host-aarch64/aarch64-gnu-debug/Dockerfile
@@ -29,19 +29,18 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
 
-ENV RUSTBUILD_FORCE_CLANG_BASED_TESTS 1
+ENV RUSTBUILD_FORCE_CLANG_BASED_TESTS="1"
 
 # llvm.use-linker conflicts with downloading CI LLVM
-ENV NO_DOWNLOAD_CI_LLVM 1
+ENV NO_DOWNLOAD_CI_LLVM="1"
 
-ENV RUST_CONFIGURE_ARGS \
-      --build=aarch64-unknown-linux-gnu \
+ENV RUST_CONFIGURE_ARGS="--build=aarch64-unknown-linux-gnu \
       --enable-debug \
       --enable-lld \
       --set llvm.use-linker=lld \
       --set target.aarch64-unknown-linux-gnu.linker=clang \
       --set target.aarch64-unknown-linux-gnu.cc=clang \
-      --set target.aarch64-unknown-linux-gnu.cxx=clang++
+      --set target.aarch64-unknown-linux-gnu.cxx=clang++"
 
 # This job appears to be checking two separate things:
 # - That we can build the compiler with `--enable-debug`
@@ -52,6 +51,5 @@ ENV RUST_CONFIGURE_ARGS \
 #     Currently we only run the subset of tests with "clang" in their name.
 #   - See also FIXME(#132034)
 
-ENV SCRIPT \
-  python3 ../x.py --stage 2 build && \
-  python3 ../x.py --stage 2 test tests/run-make tests/run-make-cargo
+ENV SCRIPT="python3 ../x.py --stage 2 build && \
+  python3 ../x.py --stage 2 test tests/run-make tests/run-make-cargo"