diff --git a/CMakeLists.txt b/CMakeLists.txt
index b73ed7328..f3b86758a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -165,7 +165,9 @@ CHECK_C_SOURCE_COMPILES(
 )
 
 set(ORIG_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
-set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror")
+if(NOT MSVC AND NOT CMAKE_C_COMPILER_ID STREQUAL "XL")
+  set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror")
+endif()
 
 CHECK_C_SOURCE_COMPILES(
   "#include <stddef.h>