diff --git a/.github/workflows/GnuTests.yml b/.github/workflows/GnuTests.yml
index 5d841d3b2..74df3792d 100644
--- a/.github/workflows/GnuTests.yml
+++ b/.github/workflows/GnuTests.yml
@@ -166,6 +166,7 @@ jobs:
         sudo locale-gen --keep-existing sv_SE
         sudo locale-gen --keep-existing sv_SE.UTF-8
         sudo locale-gen --keep-existing en_US
+        sudo locale-gen --keep-existing en_US.UTF-8
         sudo locale-gen --keep-existing ru_RU.KOI8-R
 
         sudo update-locale