diff --git a/libcxx/utils/ci/buildkite-pipeline.yml b/libcxx/utils/ci/buildkite-pipeline.yml
--- a/libcxx/utils/ci/buildkite-pipeline.yml
+++ b/libcxx/utils/ci/buildkite-pipeline.yml
@@ -27,7 +27,7 @@
     artifact_paths:
       - "**/clang-format.patch"
     agents:
-      queue: "libcxx-builders"
+      queue: "service"
     retry:
       automatic:
         - exit_status: -1  # Agent was lost
@@ -40,7 +40,7 @@
     artifact_paths:
       - "**/generated_output.patch"
     agents:
-      queue: "libcxx-builders"
+      queue: "service"
     retry:
       automatic:
         - exit_status: -1  # Agent was lost
diff --git a/libcxx/utils/ci/run-buildbot b/libcxx/utils/ci/run-buildbot
--- a/libcxx/utils/ci/run-buildbot
+++ b/libcxx/utils/ci/run-buildbot
@@ -146,7 +146,7 @@
     # Check if the diffs are empty, fail otherwise.
     ! grep -q '^--- a' ${BUILD_DIR}/generated_output.patch || false
     # Reject patches that introduce non-ASCII characters or hard tabs.
-    ! grep -rn '[^ -~]' libcxx/include/ || false
+    ! LANG=C grep -rn '[^ -~]' libcxx/include/ || false
     # Check that no dependency cycles have been introduced.
     python3 libcxx/utils/graph_header_deps.py >/dev/null
 ;;