diff --git a/CMakeLists.txt b/CMakeLists.txt
index 072a6507..db974a76 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -402,9 +402,7 @@ if(NOT MSVC)
   endif()
 
   if(POLLER STREQUAL "")
-    set(CMAKE_EXTRA_INCLUDE_FILES sys/devpoll.h)
-    check_type_size("struct pollfd" DEVPOLL)
-    set(CMAKE_EXTRA_INCLUDE_FILES)
+    check_include_files("sys/devpoll.h" HAVE_DEVPOLL)
     if(HAVE_DEVPOLL)
       set(POLLER "devpoll")
     endif()