diff --git a/chan_lcr.c b/chan_lcr.c
index 38f969b..85310ac 100644
--- a/chan_lcr.c
+++ b/chan_lcr.c
@@ -675,9 +675,19 @@ static void send_setup_to_lcr(struct chan_call *call)
                default:
                newparam.setup.callerinfo.ntype = INFO_NTYPE_UNKNOWN;
        }
+
+       /* If we don't lock the channel, the variable could disappear out from underneath us */
+       lock_debug("A10+");
+       ast_channel_lock(ast);
+       lock_debug("A10-");
        tmp = pbx_builtin_getvar_helper(ast, "LCR_TRANSFERCAPABILITY");
-       if (tmp && *tmp)
-               ast->transfercapability = atoi(tmp);
+       if (tmp && *tmp) {
+           tmp = ast_strdupa(tmp);
+           ast->transfercapability = atoi(tmp);
+       }
+       ast_channel_unlock(ast);
+       lock_debug("a10");
+
        newparam.setup.capainfo.bearer_capa = ast->transfercapability;
        newparam.setup.capainfo.bearer_mode = INFO_BMODE_CIRCUIT;
        if (call->hdlc)