diff --git a/CMakeLists.txt b/CMakeLists.txt
index 18594938..b16bdb80 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -705,7 +705,7 @@ if(LIBZMQ_WERROR)
     zmq_check_cxx_flag_prepend("/WX")
   else()
     zmq_check_cxx_flag_prepend("-Werror")
-    if(NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
+    if(${CMAKE_CXX_COMPILER_ID} MATCHES "SunPro")
       zmq_check_cxx_flag_prepend("-errwarn=%all")
     endif()
   endif()