diff --git a/.github/workflows/on-push-do-ci-build-pg15-jsonnet.yml b/.github/workflows/on-push-do-ci-build-pg15-jsonnet.yml
index 8e8ef1f5c48..15dde7be361 100644
--- a/.github/workflows/on-push-do-ci-build-pg15-jsonnet.yml
+++ b/.github/workflows/on-push-do-ci-build-pg15-jsonnet.yml
@@ -37,6 +37,7 @@ jobs:
           - 5432:5432
         env:
           POSTGRES_HOST_AUTH_METHOD: trust
+          POSTGRES_INITDB_ARGS: "--locale-provider=icu --icu-locale=en"
           POSTGRES_DB: ${{ env.pg_db }}
           NAMEDATALEN: 150
         options: >-