diff --git a/pjlib/include/pj/sock.h b/pjlib/include/pj/sock.h
index a72b63e..3245367 100644
--- a/pjlib/include/pj/sock.h
+++ b/pjlib/include/pj/sock.h
@@ -297,6 +297,10 @@
  *  @see pj_SO_REUSEADDR */
 extern const pj_uint16_t PJ_SO_REUSEADDR;
 
+/** Set the protocol-defined priority for all packets to be sent on socket.
+ */
+extern const pj_uint16_t PJ_SO_PRIORITY;
+
 /** IP multicast interface. @see pj_IP_MULTICAST_IF() */
 extern const pj_uint16_t PJ_IP_MULTICAST_IF;
  
@@ -329,6 +333,9 @@
     /** Get #PJ_SO_REUSEADDR constant */
     PJ_DECL(pj_uint16_t) pj_SO_REUSEADDR(void);
 
+    /** Get #PJ_SO_PRIORITY constant */
+    PJ_DECL(pj_uint16_t) pj_SO_PRIORITY(void);
+
     /** Get #PJ_IP_MULTICAST_IF constant */
     PJ_DECL(pj_uint16_t) pj_IP_MULTICAST_IF(void);
 
@@ -359,6 +366,9 @@
     /** Get #PJ_SO_REUSEADDR constant */
 #   define pj_SO_REUSEADDR() PJ_SO_REUSEADDR
 
+    /** Get #PJ_SO_PRIORITY constant */
+#   define pj_SO_PRIORITY() PJ_SO_PRIORITY
+
     /** Get #PJ_IP_MULTICAST_IF constant */
 #   define pj_IP_MULTICAST_IF()    PJ_IP_MULTICAST_IF