diff --git a/sql/rpl_slave.cc.orig b/sql/rpl_slave.cc
index 4c2be35..71a1f69 100644
--- a/sql/rpl_slave.cc.orig
+++ b/sql/rpl_slave.cc
@@ -8506,8 +8506,8 @@ bool queue_event(Master_info* mi,const char* buf, ulong event_len)
       char errbuf[1024];
       char llbuf[22];
       sprintf(errbuf, "heartbeat is not compatible with local info; "
-              "the event's data: log_file_name %-.512s log_pos %s",
-              hb.get_log_ident(), llstr(hb.common_header->log_pos, llbuf));
+              "the event's data: log_file_name %.*s log_pos %s",
+              hb.get_ident_len(), hb.get_log_ident(), llstr(hb.common_header->log_pos, llbuf));
       mi->report(ERROR_LEVEL, ER_SLAVE_HEARTBEAT_FAILURE,
                  ER(ER_SLAVE_HEARTBEAT_FAILURE), errbuf);
       goto err;