diff --git a/src/components/structures/IndicatorScrollbar.js b/src/components/structures/IndicatorScrollbar.js
index 4dc77d73b9..263a0a22ba 100644
--- a/src/components/structures/IndicatorScrollbar.js
+++ b/src/components/structures/IndicatorScrollbar.js
@@ -88,10 +88,10 @@ export default class IndicatorScrollbar extends React.Component {
         if (this.props.trackHorizontalOverflow) {
             this.setState({
                 // Offset from absolute position of the container
-                leftIndicatorOffset: hasLeftOverflow ? `${this._scrollElement.scrollLeft}px` : 0,
+                leftIndicatorOffset: hasLeftOverflow ? `${this._scrollElement.scrollLeft}px` : '0',
 
                 // Negative because we're coming from the right
-                rightIndicatorOffset: hasRightOverflow ? `-${this._scrollElement.scrollLeft}px` : 0,
+                rightIndicatorOffset: hasRightOverflow ? `-${this._scrollElement.scrollLeft}px` : '0',
             });
         }
     }
diff --git a/src/components/views/rooms/RoomBreadcrumbs.js b/src/components/views/rooms/RoomBreadcrumbs.js
index e3e1f2fc1e..3a71ec4ec2 100644
--- a/src/components/views/rooms/RoomBreadcrumbs.js
+++ b/src/components/views/rooms/RoomBreadcrumbs.js
@@ -134,8 +134,7 @@ export default class RoomBreadcrumbs extends React.Component {
             );
         });
         return (
-            <IndicatorScrollbar ref="scroller" className="mx_RoomBreadcrumbs" onScroll={ this._onScroll }
-                                trackHorizontalOverflow={true}>
+            <IndicatorScrollbar ref="scroller" className="mx_RoomBreadcrumbs" trackHorizontalOverflow={true}>
                 { avatars }
             </IndicatorScrollbar>
         );