diff --git a/miniupnpc/CMakeLists.txt b/miniupnpc/CMakeLists.txt
index 8a59021..a5c025f 100644
--- a/miniupnpc/CMakeLists.txt
+++ b/miniupnpc/CMakeLists.txt
@@ -30,7 +30,11 @@ endif (NO_GETADDRINFO)
 
 if (NOT WIN32)
   add_definitions (-DMINIUPNPC_SET_SOCKET_TIMEOUT)
-  add_definitions (-D_BSD_SOURCE -D_DEFAULT_SOURCE -D_POSIX_C_SOURCE=200112L)
+  add_definitions (-D_BSD_SOURCE -D_DEFAULT_SOURCE)
+  if (NOT CMAKE_SYSTEM_NAME STREQUAL "Darwin" AND NOT CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
+		# add_definitions (-D_POSIX_C_SOURCE=200112L)
+		add_definitions (-D_XOPEN_SOURCE=600)
+  endif (NOT CMAKE_SYSTEM_NAME STREQUAL "Darwin" AND NOT CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
 else (NOT WIN32)
   add_definitions (-D_WIN32_WINNT=0x0501) # XP or higher for getnameinfo and friends
 endif (NOT WIN32)