diff --git a/packages/autocomplete-js/src/utils/mergeClassNames.ts b/packages/autocomplete-js/src/utils/mergeClassNames.ts
index 6cd5c8d11..74bdff4b7 100644
--- a/packages/autocomplete-js/src/utils/mergeClassNames.ts
+++ b/packages/autocomplete-js/src/utils/mergeClassNames.ts
@@ -8,7 +8,9 @@ export function mergeClassNames(
       const accValue = acc[key];
       const currentValue = current[key];
 
-      acc[key] = [accValue, currentValue].filter(Boolean).join(' ');
+      if (accValue !== currentValue) {
+        acc[key] = [accValue, currentValue].filter(Boolean).join(' ');
+      }
     });
 
     return acc;