diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index f04fd58..8c64020 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -188,6 +188,7 @@
 gsm0808_chan_type_to_speech_codec;
 gsm0808_speech_codec_from_chan_type;
 gsm0808_speech_codec_type_names;
+gsm0808_channel_type_name;
 
 gsm0858_rsl_ul_meas_enc;