diff --git a/cmake/packaging.cmake b/cmake/packaging.cmake
index bb544109f..06a8baaf0 100644
--- a/cmake/packaging.cmake
+++ b/cmake/packaging.cmake
@@ -7,16 +7,15 @@ if(WIN32)
 	set(CPACK_GENERATOR WIX)
 
 	if(64_BIT)
-		set(CPACK_WIX_PRODUCT_GUID "E028BDFC-3FE2-4BEE-A33B-EB9C80611555")
+		set(CPACK_WIX_UPGRADE_GUID "E028BDFC-3FE2-4BEE-A33B-EB9C80611555")
 	elseif(32_BIT)
-		set(CPACK_WIX_PRODUCT_GUID "B0EEFCC7-8A9C-4471-AB10-CBD35BE3161D")
+		set(CPACK_WIX_UPGRADE_GUID "B0EEFCC7-8A9C-4471-AB10-CBD35BE3161D")
 	endif()
 
 	set(CPACK_WIX_CULTURES "en-us")
 	set(CPACK_WIX_LCID "1033")
 	set(CPACK_WIX_UI_BANNER "${CMAKE_SOURCE_DIR}/installer/bannrbmp.bmp")
 	set(CPACK_WIX_UI_DIALOG "${CMAKE_SOURCE_DIR}/installer/dlgbmp.bmp")
-	set(CPACK_WIX_PRODUCT_GUID "84afea8b-15e5-4cc7-b77d-27dd17030944")
 	set(CPACK_WIX_PRODUCT_ICON "${CMAKE_SOURCE_DIR}/icons/mumble.ico")
 	set(CPACK_WIX_EXTENSIONS "WiXUtilExtension")
 	set(CPACK_WIX_TEMPLATE "wix-template.xml")
@@ -53,8 +52,7 @@ endif()
 if(server)
 	if(NOT client)
 		if(WIN32)
-			set(CPACK_WIX_PRODUCT_GUID "ccc5eaa4-0b88-4197-9e54-580d37003903")
-			set(CPACK_WIX_UPGRADE_GUID "03e9476f-0f75-4661-bfc9-a9daeb23d3a0")
+			set(CPACK_WIX_UPGRADE_GUID "03E9476F-0F75-4661-BFC9-A9DAEB23D3A0")
 		endif()
 
 		set(CPACK_PACKAGE_NAME "Mumble (server)")
@@ -101,7 +99,6 @@ if(client AND server)
 endif()
 
 if(WIN32)
-	set(CPACK_WIX_UPGRADE_GUID ${CPACK_WIX_PRODUCT_GUID})
 	configure_file("${CMAKE_SOURCE_DIR}/installer/wix-template.xml" ${CMAKE_CURRENT_BINARY_DIR})
 endif()