diff --git a/.github/workflows/qctools.yml b/.github/workflows/qctools.yml
index 11e13a253..58e6b31b8 100644
--- a/.github/workflows/qctools.yml
+++ b/.github/workflows/qctools.yml
@@ -148,6 +148,8 @@ jobs:
         modules: ${{ matrix.qt_modules }}
 
     - name: Build qwt
+      env:
+        QT_VERSION: ${{ matrix.qt.version }}
       run: |
         git clone --branch qwt-6.2 --depth 1 https://git.code.sf.net/p/qwt/git ../qwt
         cd ../qwt