diff --git a/matrix-util.js b/matrix-util.js
index b82ae04..129f840 100644
--- a/matrix-util.js
+++ b/matrix-util.js
@@ -145,9 +145,9 @@ MatrixUtil.prototype._updateLastResponseTime = function(partner) {
     }
 
     let delta = Date.now() - Number(matrix.buddies[partner]['last_outgoing']['last_update_ts']);
-    delta = delta / 1000;
-    logger.verbose('Response time in ' + delta + ' seconds');
-    matrix.buddies[partner]['last_response_time_in_secs'] = Math.round(delta * 100) / 100;
+    delta = (delta / 1000).toFixed(2);
+    logger.verbose('MatrixUtil: Response time in ' + delta + ' seconds', {partner: partner});
+    matrix.buddies[partner]['last_response_time_in_secs'] = delta;
 }
 
 MatrixUtil.prototype._updateLastMessage = function(partner, msg, direction) {