diff --git a/plat/smpp/src/smpp_func.c b/plat/smpp/src/smpp_func.c
index cfa3475..ea2a69a 100644
--- a/plat/smpp/src/smpp_func.c
+++ b/plat/smpp/src/smpp_func.c
@@ -11,6 +11,10 @@
 #include "./include/smpp_def.h"
 
 extern int register_ssn(BYTE ssn, BYTE usertype);
+
+// by simon at 24/10/18 begin--
+extern void smeg_debug_log(const char *fmt,...)
+// --end
 /* by simon at 23/9/26 */
 SocketsMsg SockMsg;