diff --git a/src/components/scrolltop/ScrollTop.js b/src/components/scrolltop/ScrollTop.js
index 3ed27b7055..a0a7b55999 100644
--- a/src/components/scrolltop/ScrollTop.js
+++ b/src/components/scrolltop/ScrollTop.js
@@ -97,7 +97,7 @@ export class ScrollTop extends Component {
     render() {
         const className = classNames('p-scrolltop p-link p-component', {
             'p-scrolltop-sticky': this.props.target !== 'window'
-        });
+        }, this.props.className);
         const iconClassName = classNames('p-scrolltop-icon', this.props.icon);
         const isTargetParent = this.props.target === 'parent';