diff --git a/openbsc/include/openbsc/trau_upqueue.h b/openbsc/include/openbsc/trau_upqueue.h
new file mode 100644
index 0000000..ecc7658
--- /dev/null
+++ b/openbsc/include/openbsc/trau_upqueue.h
@@ -0,0 +1,7 @@
+#ifndef _TRAU_UPQUEUE_H
+#define _TRAU_UPQUEUE_H
+
+void trau_tx_to_mncc(struct gsm_network *net, struct msgb *msg);
+
+#endif /* _TRAU_UPQUEUE_H */
+
diff --git a/openbsc/src/libtrau/rtp_proxy.c b/openbsc/src/libtrau/rtp_proxy.c
index 2aa3a1e..3d34ac6 100644
--- a/openbsc/src/libtrau/rtp_proxy.c
+++ b/openbsc/src/libtrau/rtp_proxy.c
@@ -35,6 +35,7 @@
 #include <openbsc/debug.h>
 #include <openbsc/rtp_proxy.h>
 #include <openbsc/mncc.h>
+#include <openbsc/trau_upqueue.h>
 
 /* attempt to determine byte order */
 #include <sys/param.h>
diff --git a/openbsc/src/libtrau/trau_mux.c b/openbsc/src/libtrau/trau_mux.c
index 6a6b7c5..3260ff5 100644
--- a/openbsc/src/libtrau/trau_mux.c
+++ b/openbsc/src/libtrau/trau_mux.c
@@ -29,6 +29,7 @@
 #include <osmocom/abis/e1_input.h>
 #include <openbsc/debug.h>
 #include <osmocom/core/talloc.h>
+#include <openbsc/trau_upqueue.h>
 
 /* this corresponds to teh bit-lengths of the individual codec
  * parameters as indicated in Table 1.1 of TS 06.10 */