diff --git a/CMakeLists.txt b/CMakeLists.txt
index f96148567da..bbad8b3b223 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -448,12 +448,7 @@ else()
     link_libraries(global-group)
 endif ()
 
-if (NOT (OS_LINUX OR OS_DARWIN))
-    # Using system libs can cause a lot of warnings in includes (on macro expansion).
-    option(WERROR "Enable -Werror compiler option" OFF)
-else ()
-    option(WERROR "Enable -Werror compiler option" ON)
-endif ()
+option(WERROR "Enable -Werror compiler option" ON)
 
 if (WERROR)
     # Don't pollute CMAKE_CXX_FLAGS with -Werror as it will break some CMake checks.