diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 581c559..cc23da7 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -38,6 +38,8 @@ jobs:
 
         - name: Test
           shell: bash
+          env:
+            YAML_CPP_BUILD_TESTS: 'on'
           run: cd build && ctest --output-on-failure
 
   bazel-build: