diff --git a/src/corelib/Qt6CTestMacros.cmake b/src/corelib/Qt6CTestMacros.cmake
index d40be5ac61d..e45be20018a 100644
--- a/src/corelib/Qt6CTestMacros.cmake
+++ b/src/corelib/Qt6CTestMacros.cmake
@@ -125,6 +125,9 @@ function(_qt_internal_get_cmake_test_configure_options out_var)
 
     list(APPEND option_list "-DCMAKE_MESSAGE_LOG_LEVEL=DEBUG")
     list(APPEND option_list "-DCMAKE_AUTOGEN_VERBOSE=TRUE")
+    if(QT_BUILD_DIR)
+        list(APPEND option_list "-DQT_BUILD_DIR=${QT_BUILD_DIR}")
+    endif()
 
     if(APPLE AND CMAKE_OSX_ARCHITECTURES)
         list(LENGTH CMAKE_OSX_ARCHITECTURES osx_arch_count)