diff --git a/src/ci/docker/host-x86_64/mingw-check/Dockerfile b/src/ci/docker/host-x86_64/mingw-check/Dockerfile
index 4cc5d9f8a0d..a7220710830 100644
--- a/src/ci/docker/host-x86_64/mingw-check/Dockerfile
+++ b/src/ci/docker/host-x86_64/mingw-check/Dockerfile
@@ -23,6 +23,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 
 RUN curl -sL https://nodejs.org/dist/v16.9.0/node-v16.9.0-linux-x64.tar.xz | tar -xJ
 ENV PATH="/node-v16.9.0-linux-x64/bin:${PATH}"
+ENV RUST_CONFIGURE_ARGS="--set rust.validate-mir-opts=3"
+
 # Install es-check
 # Pin its version to prevent unrelated CI failures due to future es-check versions.
 RUN npm install es-check@6.1.1 eslint@8.6.0 -g
@@ -39,7 +41,7 @@ COPY host-x86_64/mingw-check/validate-error-codes.sh /scripts/
 ENV RUN_CHECK_WITH_PARALLEL_QUERIES 1
 ENV SCRIPT python3 ../x.py --stage 2 test src/tools/expand-yaml-anchors && \
            python3 ../x.py check --target=i686-pc-windows-gnu --host=i686-pc-windows-gnu --all-targets && \
-           python3 ../x.py build --stage 0 src/tools/build-manifest && \
+           python3 ../x.py build --stage 0 src/tools/build-manifest library/std && \
            python3 ../x.py test --stage 0 src/tools/compiletest && \
            python3 ../x.py test --stage 0 core alloc std test proc_macro && \
            # Build both public and internal documentation.
diff --git a/src/ci/run.sh b/src/ci/run.sh
index 1f451fc479c..93dccb54c4e 100755
--- a/src/ci/run.sh
+++ b/src/ci/run.sh
@@ -58,7 +58,6 @@ RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --disable-manage-submodules"
 RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --enable-locked-deps"
 RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --enable-cargo-native-static"
 RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set rust.codegen-units-std=1"
-RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set rust.validate-mir-opts=3"
 
 # Only produce xz tarballs on CI. gz tarballs will be generated by the release
 # process by recompressing the existing xz ones. This decreases the storage