diff --git a/include/osmocore/gsm48.h b/include/osmocore/gsm48.h
index 1e96357..b752ee0 100644
--- a/include/osmocore/gsm48.h
+++ b/include/osmocore/gsm48.h
@@ -14,4 +14,8 @@
 int gsm48_generate_mid_from_tmsi(uint8_t *buf, uint32_t tmsi);
 int gsm48_generate_mid_from_imsi(uint8_t *buf, const char *imsi);
 
+/* Convert Mobile Identity (10.5.1.4) to string */
+int gsm48_mi_to_string(char *string, const int str_len,
+			const u_int8_t *mi, const int mi_len);
+
 #endif