--- a/mobile/chrome/content/InputHandler.js
+++ b/mobile/chrome/content/InputHandler.js
@@ -1096,17 +1096,17 @@ KineticController.prototype = {
     let now = t || Date.now();
  
     // avoid adding duplicates which would otherwise slow down the speed
     if (mbLength > 0) {
       let mbLast = this.momentumBuffer[mbLength - 1];
       if ((mbLast.sx == sx && mbLast.sy == sy) || mbLast.t == now) {
         mbLast.sx = sx;
         mbLast.sy = sy;
-        mbLast.t = t;
+        mbLast.t = now;
         return;
       }
     }
 
     // Util.dumpLn("adding t:", now, ", sx: ", sx, ", sy: ", sy);
     this.momentumBuffer.push({'t': now, 'sx' : sx, 'sy' : sy});
   }
 };