diff --git a/pjsip/src/test/main.c b/pjsip/src/test/main.c
index 044cd51..2289f69 100644
--- a/pjsip/src/test/main.c
+++ b/pjsip/src/test/main.c
@@ -39,6 +39,8 @@
     int retval;
     char **opt_arg;
 
+    PJ_UNUSED_ARG(argc);
+
     /* Parse arguments. */
     opt_arg = argv+1;
     while (*opt_arg) {