diff --git a/miniupnpc/Makefile b/miniupnpc/Makefile
index ca57dfa..00c9092 100644
--- a/miniupnpc/Makefile
+++ b/miniupnpc/Makefile
@@ -35,7 +35,9 @@ CFLAGS += -W -Wstrict-prototypes
 CFLAGS += -fno-common
 CFLAGS += -DMINIUPNPC_SET_SOCKET_TIMEOUT
 CFLAGS += -DMINIUPNPC_GET_SRC_ADDR
-CFLAGS += -D_BSD_SOURCE -D_DEFAULT_SOURCE -D_POSIX_C_SOURCE=200112L
+CFLAGS += -D_BSD_SOURCE -D_DEFAULT_SOURCE
+#CFLAGS += -D_POSIX_C_SOURCE=200112L
+CFLAGS += -D_XOPEN_SOURCE=600
 CFLAGS += -ansi
 # -DNO_GETADDRINFO
 INSTALL = install