diff --git a/.github/workflows/github-cxx-qt-tests.yml b/.github/workflows/github-cxx-qt-tests.yml
index de7644436..f02e66305 100644
--- a/.github/workflows/github-cxx-qt-tests.yml
+++ b/.github/workflows/github-cxx-qt-tests.yml
@@ -213,7 +213,7 @@ jobs:
         CC: ${{ matrix.cc }}
         CXX: ${{ matrix.cxx }}
     - name: "Build"
-      run: cmake --build build --config Release
+      run: cmake --build build --config Release --parallel 1
       working-directory: ${{ matrix.workspace }}
       env:
         RUSTC_WRAPPER: sccache