diff --git a/cmake/re-config.cmake b/cmake/re-config.cmake
index c45216800..f914f761f 100644
--- a/cmake/re-config.cmake
+++ b/cmake/re-config.cmake
@@ -80,9 +80,11 @@ if(HAVE_THREADS)
   list(APPEND RE_DEFINITIONS HAVE_THREADS)
 endif()
 
-check_function_exists(accept4 HAVE_ACCEPT4)
-if(HAVE_ACCEPT4)
-  list(APPEND RE_DEFINITIONS HAVE_ACCEPT4)
+if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+  check_function_exists(accept4 HAVE_ACCEPT4)
+  if(HAVE_ACCEPT4)
+    list(APPEND RE_DEFINITIONS HAVE_ACCEPT4)
+  endif()
 endif()
 
 if(CMAKE_USE_PTHREADS_INIT)