diff --git a/src/tbf.cpp b/src/tbf.cpp
index 0fec476..54ae4fa 100644
--- a/src/tbf.cpp
+++ b/src/tbf.cpp
@@ -1198,3 +1198,8 @@
 {
 	return tbf->is_tfi_assigned();
 }
+
+uint8_t tbf_tfi(const struct gprs_rlcmac_tbf *tbf)
+{
+	return tbf->tfi();
+}