diff --git a/src/pages/home/previews/image.tsx b/src/pages/home/previews/image.tsx
index e9031986d..fa41586fa 100644
--- a/src/pages/home/previews/image.tsx
+++ b/src/pages/home/previews/image.tsx
@@ -43,7 +43,7 @@ import { Obj, ObjType } from "~/types"
 import { ext, formatDate, getFileSize, loadScriptIIFE } from "~/utils"
 
 const HEIF_EXTS = new Set(["heic", "heif", "avif", "vvc", "avc"])
-const isHeif = (name: string) => HEIF_EXTS.has(ext(name))
+const isHeif = (name: string) => HEIF_EXTS.has(ext(name).toLowerCase())
 const ZOOM_MIN = 0.1
 const ZOOM_MAX = 10
 const ZOOM_WHEEL_FACTOR = 1.08