diff --git a/src/components/views/elements/Slider.tsx b/src/components/views/elements/Slider.tsx
index 6712ddd7fd..adb2a6063b 100644
--- a/src/components/views/elements/Slider.tsx
+++ b/src/components/views/elements/Slider.tsx
@@ -82,7 +82,7 @@ export default class Slider extends React.Component<IProps> {
 
         let selection = null;
 
-        if (this.props.disabled) {
+        if (!this.props.disabled) {
             const offset = this.offset(this.props.values, this.props.value);
             selection = <div className="mx_Slider_selection">
                 <div className="mx_Slider_selectionDot" style={{left: "calc(-0.55em + " + offset + "%)"}} />