diff --git a/app/ui.js b/app/ui.js
index 4fe2a3fb..83c2161f 100644
--- a/app/ui.js
+++ b/app/ui.js
@@ -1,7 +1,7 @@
 /*
  * noVNC: HTML5 VNC client
  * Copyright (C) 2012 Joel Martin
- * Copyright (C) 2016 Samuel Mannehed for Cendio AB
+ * Copyright (C) 2018 Samuel Mannehed for Cendio AB
  * Copyright (C) 2016 Pierre Ossman for Cendio AB
  * Licensed under MPL 2.0 (see LICENSE.txt)
  *
@@ -10,7 +10,7 @@
 
 import * as Log from '../core/util/logging.js';
 import _, { l10n } from './localization.js';
-import { isTouchDevice } from '../core/util/browser.js';
+import { isTouchDevice, dragThreshold } from '../core/util/browser.js';
 import { setCapture, getPointerEvent } from '../core/util/events.js';
 import KeyTable from "../core/input/keysym.js";
 import keysyms from "../core/input/keysymdef.js";
@@ -594,9 +594,6 @@ const UI = {
         }
 
         if (!UI.controlbarDrag) {
-            // The goal is to trigger on a certain physical width, the
-            // devicePixelRatio brings us a bit closer but is not optimal.
-            const dragThreshold = 10 * (window.devicePixelRatio || 1);
             const dragDistance = Math.abs(ptr.clientY - UI.controlbarMouseDownClientY);
 
             if (dragDistance < dragThreshold) return;
diff --git a/core/rfb.js b/core/rfb.js
index 34330302..0276f167 100644
--- a/core/rfb.js
+++ b/core/rfb.js
@@ -12,6 +12,7 @@
 
 import * as Log from './util/logging.js';
 import { decodeUTF8 } from './util/strings.js';
+import { dragThreshold } from './util/browser.js';
 import EventTargetMixin from './util/eventtarget.js';
 import Display from "./display.js";
 import Keyboard from "./input/keyboard.js";
@@ -785,10 +786,6 @@ export default class RFB extends EventTargetMixin {
             const deltaX = this._viewportDragPos.x - x;
             const deltaY = this._viewportDragPos.y - y;
 
-            // The goal is to trigger on a certain physical width, the
-            // devicePixelRatio brings us a bit closer but is not optimal.
-            const dragThreshold = 10 * (window.devicePixelRatio || 1);
-
             if (this._viewportHasMoved || (Math.abs(deltaX) > dragThreshold ||
                                            Math.abs(deltaY) > dragThreshold)) {
                 this._viewportHasMoved = true;
diff --git a/core/util/browser.js b/core/util/browser.js
index 80551d40..3eca5bc0 100644
--- a/core/util/browser.js
+++ b/core/util/browser.js
@@ -1,6 +1,7 @@
 /*
  * noVNC: HTML5 VNC client
  * Copyright (C) 2012 Joel Martin
+ * Copyright (C) 2018 Samuel Mannehed for Cendio AB
  * Licensed under MPL 2.0 (see LICENSE.txt)
  *
  * See README.md for usage and integration instructions.
@@ -20,6 +21,11 @@ window.addEventListener('touchstart', function onFirstTouch() {
     window.removeEventListener('touchstart', onFirstTouch, false);
 }, false);
 
+
+// The goal is to find a certain physical width, the devicePixelRatio
+// brings us a bit closer but is not optimal.
+export let dragThreshold = 10 * (window.devicePixelRatio || 1);
+
 let _cursor_uris_supported = null;
 
 export function supportsCursorURIs () {