diff --git a/.github/workflows/GnuTests.yml b/.github/workflows/GnuTests.yml
index 3e7266506c6..3a52c2de5b6 100644
--- a/.github/workflows/GnuTests.yml
+++ b/.github/workflows/GnuTests.yml
@@ -88,6 +88,7 @@ jobs:
         sudo locale-gen --keep-existing am_ET.UTF-8 # Ethiopia
         sudo locale-gen --keep-existing th_TH.UTF-8 # Thailand
         sudo locale-gen --keep-existing zh_CN.GB18030 # China
+        sudo localedef --no-archive --no-warnings=ascii -f SHIFT_JIS -i ja_JP ja_JP.SHIFT_JIS
 
         sudo update-locale
         echo "After:"