diff --git a/packages/grafana-ui/src/components/Cascader/Cascader.tsx b/packages/grafana-ui/src/components/Cascader/Cascader.tsx
index 4a19adfb964..028c9ba2cff 100644
--- a/packages/grafana-ui/src/components/Cascader/Cascader.tsx
+++ b/packages/grafana-ui/src/components/Cascader/Cascader.tsx
@@ -205,6 +205,7 @@ export class Cascader extends React.PureComponent<CascaderProps, CascaderState>
           >
             <div className={disableDivFocus}>
               <Input
+                size={size || 'md'}
                 placeholder={placeholder}
                 value={activeLabel}
                 onKeyDown={this.onInputKeyDown}