diff --git a/src/ol/control/Attribution.js b/src/ol/control/Attribution.js
index 9405c58193..ddc6146f76 100644
--- a/src/ol/control/Attribution.js
+++ b/src/ol/control/Attribution.js
@@ -96,7 +96,7 @@ class Attribution extends Control {
     const expandClassName =
       options.expandClassName !== undefined
       ? options.expandClassName
-      : (className + '-expand');
+      : className + '-expand';
 
     const collapseLabel =
       options.collapseLabel !== undefined ? options.collapseLabel : '\u00BB';
@@ -104,7 +104,7 @@ class Attribution extends Control {
     const collapseClassName =
       options.collapseClassName !== undefined
       ? options.collapseClassName
-      : (className + '-collpase');
+      : className + '-collpase';
 
     if (typeof collapseLabel === 'string') {
       /**
diff --git a/src/ol/control/Zoom.js b/src/ol/control/Zoom.js
index 886dca9e86..27a37db573 100644
--- a/src/ol/control/Zoom.js
+++ b/src/ol/control/Zoom.js
@@ -51,11 +51,11 @@ class Zoom extends Control {
     const zoomInClassName =
       options.zoomInClassName !== undefined
         ? options.zoomInClassName
-        : (className + '-in');
+        : className + '-in';
     const zoomOutClassName =
       options.zoomOutClassName !== undefined
         ? options.zoomOutClassName
-        : (className + '-out');
+        : className + '-out';
 
     const zoomInLabel =
       options.zoomInLabel !== undefined ? options.zoomInLabel : '+';