diff --git a/pjsip/include/pjsua-lib/pjsua.h b/pjsip/include/pjsua-lib/pjsua.h
index d6db65b..c0eb8b2 100644
--- a/pjsip/include/pjsua-lib/pjsua.h
+++ b/pjsip/include/pjsua-lib/pjsua.h
@@ -1725,6 +1725,17 @@
 
 
 /**
+ * Default maximum time to wait for account unregistration transactions to
+ * complete during library shutdown sequence.
+ *
+ * Default: 4000 (4 seconds)
+ */
+#ifndef PJSUA_UNREG_TIMEOUT
+#   define PJSUA_UNREG_TIMEOUT	    4000
+#endif
+
+
+/**
  * Default PUBLISH expiration
  */
 #ifndef PJSUA_PUBLISH_EXPIRATION
@@ -1919,6 +1930,14 @@
      */
     unsigned	    reg_timeout;
 
+    /**
+     * Specify the maximum time to wait for unregistration requests to
+     * complete during library shutdown sequence.
+     *
+     * Default: PJSUA_UNREG_TIMEOUT
+     */
+    unsigned	    unreg_timeout;
+
     /** 
      * Number of credentials in the credential array.
      */