diff --git a/CMakeCPack.cmake b/CMakeCPack.cmake
index a27d00004..2495c4476 100644
--- a/CMakeCPack.cmake
+++ b/CMakeCPack.cmake
@@ -113,6 +113,8 @@ if(EXISTS "${CMAKE_ROOT}/Modules/CPack.cmake")
     include(Utilities/Release/Cygwin/CMakeLists.txt)
   endif()
 
+  set(CPACK_WIX_UPGRADE_GUID "8ffd1d72-b7f1-11e2-8ee5-00238bca4991")
+
   # Set the options file that needs to be included inside CMakeCPackOptions.cmake
   set(QT_DIALOG_CPACK_OPTIONS_FILE ${CMake_BINARY_DIR}/Source/QtDialog/QtDialogCPack.cmake)
   configure_file("${CMake_SOURCE_DIR}/CMakeCPackOptions.cmake.in"