diff --git a/openbsc/src/Makefile.am b/openbsc/src/Makefile.am
index 7651132..d28c803 100644
--- a/openbsc/src/Makefile.am
+++ b/openbsc/src/Makefile.am
@@ -34,5 +34,5 @@
 
 isdnsync_SOURCES = isdnsync.c
 
-bsc_mgcp_SOURCES = bsc_mgcp.c msgb.c talloc.c debug.c select.c timer.c
+bsc_mgcp_SOURCES = bsc_mgcp.c msgb.c talloc.c debug.c select.c timer.c telnet_interface.c
 bsc_mgcp_LDADD = libvty.a