diff --git a/package.json b/package.json
index e18d56d..051b315 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "drag-timetable",
-  "version": "1.0.9",
+  "version": "1.0.10",
   "description": "Simple, customizable draggable timetable.",
   "main": "dist/app.js",
   "scripts": {
diff --git a/src/drag.js b/src/drag.js
index 5e0805c..a37a0dd 100644
--- a/src/drag.js
+++ b/src/drag.js
@@ -46,7 +46,8 @@ class TimetableDraggable {
         this.currentGhostElement.style.left = (ev.pageX - this.startOffsetX) + "px";
         this.currentGhostElement.style.top = (ev.pageY - this.startOffsetY) + "px";
       }
-      this.dragManager.spacer.moveUpdate(ev.pageY - this.startOffsetY - document.documentElement.scrollTop, this.taskId);
+      const scrollOffset = window.pageYOffset || document.documentElement.scrollTop;
+      this.dragManager.spacer.moveUpdate(ev.pageY - this.startOffsetY - scrollOffset, this.taskId);
     }
   }
 }