diff --git a/.travis.yml b/.travis.yml
index 8374844cec..50adfc2ef4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -192,13 +192,6 @@ after_success:
         FILE_ENV="./ci/test/00_setup_env_arm.sh"
         QEMU_USER_CMD=""
 
-    - stage: test
-      name: 'S390x  [GOAL: install]  [focal]  [unit tests, functional tests]'
-      arch: s390x  # Can disable QEMU_USER_CMD and run the tests natively without qemu
-      env: >-
-        FILE_ENV="./ci/test/00_setup_env_s390x.sh"
-        QEMU_USER_CMD=""
-
     - stage: test
       name: 'Win64  [GOAL: deploy]  [unit tests, no gui, no boost::process, no functional tests]'
       env: >-
diff --git a/ci/dash/test_unittests.sh b/ci/dash/test_unittests.sh
index 1b0796b340..02e3af883d 100755
--- a/ci/dash/test_unittests.sh
+++ b/ci/dash/test_unittests.sh
@@ -29,8 +29,8 @@ if [ "$DIRECT_WINE_EXEC_TESTS" = "true" ]; then
   wine ./src/test/test_dash.exe
 else
   if [ "$RUN_UNIT_TESTS_SEQUENTIAL" = "true" ]; then
-    ./src/test/test_dash --catch_system_errors=no -l test_suite
+    ${TEST_RUNNER_ENV} ./src/test/test_dash --catch_system_errors=no -l test_suite
   else
-      make $MAKEJOBS check VERBOSE=1
+      ${TEST_RUNNER_ENV} make $MAKEJOBS check VERBOSE=1
   fi
 fi
diff --git a/ci/test/00_setup_env_s390x.sh b/ci/test/00_setup_env_s390x.sh
index a46bde95b5..c71a4891b9 100644
--- a/ci/test/00_setup_env_s390x.sh
+++ b/ci/test/00_setup_env_s390x.sh
@@ -19,6 +19,7 @@ fi
 # Use debian to avoid 404 apt errors
 export CONTAINER_NAME=ci_s390x
 export RUN_UNIT_TESTS=true
+export TEST_RUNNER_ENV="LC_ALL=C"
 export RUN_FUNCTIONAL_TESTS=true
 export GOAL="install"
 export BITCOIN_CONFIG="--enable-reduce-exports --disable-gui-tests --with-boost-process"  # GUI tests disabled for now, see https://github.com/bitcoin/bitcoin/issues/23730