diff --git a/utils/pictureData.tsx b/utils/pictureData.tsx
index 5be66147..96091e79 100644
--- a/utils/pictureData.tsx
+++ b/utils/pictureData.tsx
@@ -61,7 +61,7 @@ export const pictureData: Picture[] = [
             en: "Cassius",
             jp: "カシウス"
         },
-        filename: "Cassius",
+        filename: "cassius",
         element: "dark"
     },
     {