diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 7be7670..1dab49c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -17,7 +17,7 @@ jobs:
     - name: configure
       run: |
          if [ "$RUNNER_OS" == "Linux" ]; then
-          export CXX=g++-9
+          export CXX=g++-8
          fi
       shell: bash
     - uses: actions/checkout@v2