diff --git a/companion/src/thirdparty/maxlibqt/src/widgets/CMakeLists.txt b/companion/src/thirdparty/maxlibqt/src/widgets/CMakeLists.txt
index 29cd334bb..1f7c606b8 100644
--- a/companion/src/thirdparty/maxlibqt/src/widgets/CMakeLists.txt
+++ b/companion/src/thirdparty/maxlibqt/src/widgets/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 2.8.12)
 cmake_policy(SET CMP0020 NEW)
 set(CMAKE_CXX_STANDARD 11)
 if (CMAKE_VERSION VERSION_LESS "3.1" AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-	list(APPEND CMAKE_CXX_FLAGS --std=gnu++11)
+	set (CMAKE_CXX_FLAGS "--std=gnu++11 ${CMAKE_CXX_FLAGS}")
 endif ()
 
 find_package(Qt5Core)