diff --git a/cmake/compiler_settings.cmake b/cmake/compiler_settings.cmake
index a7689dc595..13e594f12c 100644
--- a/cmake/compiler_settings.cmake
+++ b/cmake/compiler_settings.cmake
@@ -153,9 +153,6 @@ macro(set_msvc_warnings)
         endif()
 
         # warnings as errors, max warning level (4)
-        if(NOT CMAKE_CXX_FLAGS MATCHES "/WX")
-            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /WX")
-        endif()
 
         # taken from http://stackoverflow.com/questions/2368811/how-to-set-warning-level-in-cmake
         if(CMAKE_CXX_FLAGS MATCHES "/W[0-4]")