diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 14522f100f..352e280762 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -481,6 +481,7 @@ jobs:
           TFLAGS="-j20 ${TFLAGS}"
           source ~/venv/bin/activate
           if [[ "${MATRIX_INSTALL_STEPS}" = *'codeset-test'* ]]; then
+            export LC_ALL=C
             export LC_CTYPE=C
             export LC_NUMERIC=fr_FR.UTF-8
           fi