diff --git a/matrix-util.js b/matrix-util.js
index 88199fb..2137cf3 100644
--- a/matrix-util.js
+++ b/matrix-util.js
@@ -67,7 +67,7 @@ MatrixUtil.prototype.updateBuddyState = function(jid, state, statusText, resourc
         matrix.buddies[jid]['resources'][resource] = {
             state: state,
             statusText: statusText,
-            lastUpdate: moment().format('YYYY-MM-DD HH:mm:ss')
+            last_update: moment().format('YYYY-MM-DD HH:mm:ss')
         }
     }
     catch(e) {
@@ -142,7 +142,7 @@ MatrixUtil.prototype._updateLastMessage = function(partner, msg, direction) {
 
     matrix.buddies[partner]['last_' + direction] = {
         msg: msg,
-        lastUpdate: moment().format('YYYY-MM-DD HH:mm:ss')
+        last_update: moment().format('YYYY-MM-DD HH:mm:ss')
     }
 }