diff --git a/build.symbian/pjsip.mmp b/build.symbian/pjsip.mmp
index 6269b47..1fd7440 100644
--- a/build.symbian/pjsip.mmp
+++ b/build.symbian/pjsip.mmp
@@ -43,6 +43,7 @@
 SOURCE	sip_endpoint_wrap.cpp
 SOURCE	sip_errno.c
 SOURCE	sip_msg.c
+SOURCE	sip_multipart.c
 SOURCE	sip_parser_wrap.cpp
 SOURCE	sip_resolve.c
 SOURCE	sip_tel_uri_wrap.cpp