diff --git a/.forgejo/workflows/ci-cmake.yaml b/.forgejo/workflows/ci-cmake.yaml
index d846a94c..fab0ce0e 100644
--- a/.forgejo/workflows/ci-cmake.yaml
+++ b/.forgejo/workflows/ci-cmake.yaml
@@ -32,7 +32,7 @@ jobs:
           PREFIX=${{github.workspace}}/local
           PATH=$PREFIX/bin:$PATH
           echo "::group::xo-indentlog configure"
-          cmake -S xo-indentlog -B .build/xo-indentlog -DCMAKE_INSTALL_PREFIX=$PREFIX -DCMAKE_PREFIX_PATH=$PREFIX -DENABLE_TESTING
+          cmake -S xo-indentlog -B .build/xo-indentlog -DCMAKE_INSTALL_PREFIX=$PREFIX -DCMAKE_PREFIX_PATH=$PREFIX -DENABLE_TESTING=1
           echo "::endgroup::"
           echo "::group::xo-indentlog build"
           cmake --build .build/xo-indentlog