diff --git a/cmake/QtTestHelpers.cmake b/cmake/QtTestHelpers.cmake
index b2fab788a4..e1da4a5340 100644
--- a/cmake/QtTestHelpers.cmake
+++ b/cmake/QtTestHelpers.cmake
@@ -158,7 +158,7 @@ function(qt_internal_setup_docker_test_fixture name)
     foreach(test_name ${name} ${name}-setup ${name}-cleanup)
         set_property(TEST "${test_name}" APPEND PROPERTY ENVIRONMENT "testserver=${QT_DOCKER_COMPOSE_VERSION}")
         set_property(TEST "${test_name}" APPEND PROPERTY ENVIRONMENT TEST_DOMAIN=${DNSDOMAIN})
-        set_property(TEST "${test_name}" APPEND PROPERTY ENVIRONMENT "SHARED_DATA=${QT_SOURCE_TREE}/mkspecs/features/data/testserver")
+        set_property(TEST "${test_name}" APPEND PROPERTY ENVIRONMENT "SHARED_DATA=${QT_MKSPECS_DIR}/features/data/testserver")
         set_property(TEST "${test_name}" APPEND PROPERTY ENVIRONMENT SHARED_SERVICE=bridge-network)
     endforeach()