diff --git a/miniupnpc/Makefile b/miniupnpc/Makefile
index 5c23000..72cdc0f 100644
--- a/miniupnpc/Makefile
+++ b/miniupnpc/Makefile
@@ -43,10 +43,12 @@ CFLAGS += -D_NETBSD_SOURCE
 endif
 ifneq ($(OS), FreeBSD)
 ifneq ($(OS), Darwin)
+ifneq ($(OS), SunOS)
 #CFLAGS += -D_POSIX_C_SOURCE=200112L
 CFLAGS += -D_XOPEN_SOURCE=600
 endif
 endif
+endif
 #CFLAGS += -ansi
 # -DNO_GETADDRINFO
 INSTALL = install
diff --git a/miniupnpc/minissdpc.c b/miniupnpc/minissdpc.c
index f200f07..263160e 100644
--- a/miniupnpc/minissdpc.c
+++ b/miniupnpc/minissdpc.c
@@ -73,6 +73,9 @@ struct sockaddr_un {
 
 #if !defined(HAS_IP_MREQN) && !defined(_WIN32)
 #include <sys/ioctl.h>
+#if defined(__sun)
+#include <sys/sockio.h>
+#endif
 #endif
 
 #if defined(HAS_IP_MREQN) && defined(NEED_STRUCT_IP_MREQN)