diff --git a/packages/bezier-react/src/components/Banner/Banner.tsx b/packages/bezier-react/src/components/Banner/Banner.tsx
index db174420e..6901b34e6 100644
--- a/packages/bezier-react/src/components/Banner/Banner.tsx
+++ b/packages/bezier-react/src/components/Banner/Banner.tsx
@@ -96,18 +96,14 @@ export const Banner = forwardRef<HTMLDivElement, BannerProps>(function Banner(
         <div className={styles.Center}>
           {isBezierIcon(icon) ? (
             <Icon
-              className={classNames({
-                [styles.Icon]: !iconColor,
-              })}
+              className={classNames(!iconColor && styles.Icon)}
               source={icon}
               color={iconColor}
               size="s"
             />
           ) : (
             <LegacyIcon
-              className={classNames({
-                [styles.Icon]: !iconColor,
-              })}
+              className={classNames(!iconColor && styles.Icon)}
               name={icon}
               color={iconColor}
               size="s"