diff --git a/.github/workflows/ant-build-pull-request.yaml b/.github/workflows/ant-build-pull-request.yaml
index e87527816..3c6dfb0e6 100644
--- a/.github/workflows/ant-build-pull-request.yaml
+++ b/.github/workflows/ant-build-pull-request.yaml
@@ -4,6 +4,7 @@ on: pull_request
 
 jobs:
   build:
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@master
     - name: Set up JDK 8