diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index f5ddc32a..e6ae6341 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -187,6 +187,7 @@ jobs:
             -DCMAKE_BUILD_TYPE=${{ matrix.config.build_type }} \
             -G "${{ matrix.config.generators }}" \
             -DCMAKE_INSTALL_PREFIX:PATH=instdir
+            -DQt5_DIR:PATH=%Qt5_DIR%
       - name: Build
         shell: bash
         run: cmake --build . --config ${{ matrix.config.build_type }}