diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 6998c6f340819e..6ba858acb39298 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -102,7 +102,7 @@ jobs:
         if: ${{ matrix.test_task == 'check' }}
       - name: make ${{ matrix.test_task }}
         run: |
-          $SETARCH make -s ${{ matrix.test_task }} ${TESTS:+TESTS=`echo "$TESTS" | sed 's| |$$/ -n!/|g;s|^|-n!/|;s|$|$$/|'`}
+          $SETARCH make -s ${{ matrix.test_task }} ${TESTS:+TESTS=`echo "$TESTS" | sed 's| |$$/ -n!/|g;s|^|-n!/|;s|$|$$/|'`} RUBYOPT=-w
         timeout-minutes: 40
         env:
           RUBY_TESTOPTS: "-q --tty=no"