diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index 9d15d66..c337def 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -66,6 +66,7 @@
 gsm340_gen_scts;
 gsm340_scts;
 gsm340_validity_period;
+gsm340_validity_time;
 
 gsm411_bcdify;
 gsm411_msgb_alloc;