diff --git a/src/components/structures/RoomView.js b/src/components/structures/RoomView.js
index a0c36374b6..9414a59e01 100644
--- a/src/components/structures/RoomView.js
+++ b/src/components/structures/RoomView.js
@@ -271,6 +271,7 @@ module.exports = React.createClass({
 
         this._updateConfCallNotification();
 
+        window.addEventListener('beforeunload', this.onPageUnload);
         window.addEventListener('resize', this.onResize);
         this.onResize();
 
@@ -353,6 +354,7 @@ module.exports = React.createClass({
             MatrixClientPeg.get().removeListener("accountData", this.onAccountData);
         }
 
+        window.removeEventListener('beforeunload', this.onPageUnload);
         window.removeEventListener('resize', this.onResize);
 
         document.removeEventListener("keydown", this.onKeyDown);
@@ -365,6 +367,14 @@ module.exports = React.createClass({
         // Tinter.tint(); // reset colourscheme
     },
 
+    onPageUnload(event) {
+        if (ContentMessages.getCurrentUploads().length > 0) {
+            return event.returnValue =
+                'You seem to be uploading files, are you sure you want to quit?';
+        }
+    },
+
+
     onKeyDown: function(ev) {
         let handled = false;
         const isMac = navigator.platform.toUpperCase().indexOf('MAC') >= 0;