diff --git a/.gitea/workflows/ubuntu.yaml b/.gitea/workflows/ubuntu.yaml
index fc3f8d3..fc010af 100644
--- a/.gitea/workflows/ubuntu.yaml
+++ b/.gitea/workflows/ubuntu.yaml
@@ -17,7 +17,7 @@ jobs:
       - name: build
         run: |
           mkdir build && cd build
-          cmake ..
+          cmake .. -DMRUBYPP_BUILD_TEST=ON
           cmake --build . --target mrubypp_test
           ./mrubypp_test
       - run: echo "🍏 This job's status is ${{ job.status }}."
\ No newline at end of file