diff --git a/ui/src/utils/thumbnail.ts b/ui/src/utils/thumbnail.ts
index bc70a8d64..08adeb5e2 100644
--- a/ui/src/utils/thumbnail.ts
+++ b/ui/src/utils/thumbnail.ts
@@ -13,11 +13,17 @@ export function generateThumbnailUrl(
 ) {
   const { origin } = location;
 
+  const width = THUMBNAIL_WIDTH_MAP[size];
+
+  if (!width) {
+    return url;
+  }
+
   if (url.startsWith(origin) || url.startsWith("/")) {
-    return `${url}?width=${THUMBNAIL_WIDTH_MAP[size]}`;
+    return `${url}?width=${width}`;
   }
 
   return `/apis/api.storage.halo.run/v1alpha1/thumbnails/-/via-uri?uri=${encodeURIComponent(
     url
-  )}&size=${size}`;
+  )}&width=${width}`;
 }