diff --git a/include/sys/socket.h b/include/sys/socket.h
index cf3ed72..b572009 100644
--- a/include/sys/socket.h
+++ b/include/sys/socket.h
@@ -11,4 +11,12 @@
 	 ((struct sockaddr*)(X))->sa_family == AF_INET6 ? sizeof(struct sockaddr_in6) : \
 	 ((struct sockaddr*)(X))->sa_family == AF_UNSPEC ? sizeof(struct sockaddr) : \
 	   sizeof(struct sockaddr))
+
+/*
+ * Prevent Solaris 10 system header leakage
+ */
+#ifdef MODEMASK
+#undef MODEMASK
+#endif
+
 #endif