diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 3d08232..dcc491d 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -206,6 +206,7 @@
 gsm0808_chan_type_to_speech_codec;
 gsm0808_speech_codec_from_chan_type;
 gsm0808_sc_cfg_from_gsm48_mr_cfg;
+gsm48_mr_cfg_from_gsm0808_sc_cfg;
 gsm0808_speech_codec_type_names;
 gsm0808_permitted_speech_names;
 gsm0808_chosen_enc_alg_names;