diff --git a/cmake/QtModuleHelpers.cmake b/cmake/QtModuleHelpers.cmake
index f976833d359..fec07c6dc8e 100644
--- a/cmake/QtModuleHelpers.cmake
+++ b/cmake/QtModuleHelpers.cmake
@@ -766,6 +766,9 @@ set(QT_ALLOW_MISSING_TOOLS_PACKAGES TRUE)")
         set(args "")
         if(QT_WILL_INSTALL)
             set(metatypes_install_dir "${INSTALL_ARCHDATADIR}/metatypes")
+            if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.31")
+                cmake_path(SET metatypes_install_dir NORMALIZE "${metatypes_install_dir}")
+            endif()
             list(APPEND args
                 __QT_INTERNAL_INSTALL __QT_INTERNAL_INSTALL_DIR "${metatypes_install_dir}")
         endif()
diff --git a/src/corelib/CMakeLists.txt b/src/corelib/CMakeLists.txt
index aa940a3d26a..e8d7320c0bf 100644
--- a/src/corelib/CMakeLists.txt
+++ b/src/corelib/CMakeLists.txt
@@ -412,6 +412,9 @@ set(core_metatype_args MANUAL_MOC_JSON_FILES ${core_qobject_metatypes_json_list}
 
 if(QT_WILL_INSTALL)
     set(metatypes_install_dir ${INSTALL_ARCHDATADIR}/metatypes)
+    if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.31")
+        cmake_path(SET metatypes_install_dir NORMALIZE "${metatypes_install_dir}")
+    endif()
     list(APPEND core_metatype_args
         __QT_INTERNAL_INSTALL __QT_INTERNAL_INSTALL_DIR "${metatypes_install_dir}")
 endif()