diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 5cfc08989ee48f..fdab8accba0ff1 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -95,7 +95,7 @@ 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|$|$$/|'`}
         timeout-minutes: 40
         env:
           RUBY_TESTOPTS: "-q --tty=no"
@@ -104,7 +104,7 @@ jobs:
           PRECHECK_BUNDLED_GEMS: "no"
       - name: make skipped tests
         run: |
-          $SETARCH make -s test-all TESTS=`echo "$TESTS" | sed 's| |$/ -n/|g;s|^|-n/|;s|$|$$/|'`
+          $SETARCH make -s test-all TESTS=`echo "$TESTS" | sed 's| |$$/ -n/|g;s|^|-n/|;s|$|$$/|'`
         env:
           GNUMAKEFLAGS: ""
           RUBY_TESTOPTS: "-v --tty=no"