diff --git a/src/vaadin-date-picker-overlay-content.html b/src/vaadin-date-picker-overlay-content.html
index 4842fd50..5d326314 100644
--- a/src/vaadin-date-picker-overlay-content.html
+++ b/src/vaadin-date-picker-overlay-content.html
@@ -526,7 +526,7 @@
 
           var duration = animate ? 300 : 0;
           var start = 0;
-          var initialPosition = this.$.monthScroller.position;
+          var initialPosition = Math.round(this.$.monthScroller.position);
 
           var smoothScroll = timestamp => {
             start = start || timestamp;