diff --git a/src/app/shared/search/models/search-filter-config.model.ts b/src/app/shared/search/models/search-filter-config.model.ts
index 59512ee29da..b75d4d1f10d 100644
--- a/src/app/shared/search/models/search-filter-config.model.ts
+++ b/src/app/shared/search/models/search-filter-config.model.ts
@@ -47,7 +47,7 @@ import { CacheableObject } from '../../../core/cache/cacheable-object.model';
     /**
      * Defines if the item facet is collapsed by default or not on the search page
      */
-    @autoserialize
+    @autoserializeAs(Boolean, 'openByDefault')
     isOpenByDefault: boolean;
 
     /**