diff --git a/build.symbian/pjsip.mmp b/build.symbian/pjsip.mmp
index 785a799..b74f4de 100644
--- a/build.symbian/pjsip.mmp
+++ b/build.symbian/pjsip.mmp
@@ -51,6 +51,7 @@
 SOURCE	sip_transport_loop.c
 SOURCE	sip_transport_tcp.c
 SOURCE	sip_transport_udp.c
+SOURCE	sip_transport_tls.c
 SOURCE	sip_ua_layer.c
 SOURCE	sip_uri.c
 SOURCE	sip_util_wrap.cpp