diff --git a/ts/background.ts b/ts/background.ts
index c17ac08..06bc6a8 100644
--- a/ts/background.ts
+++ b/ts/background.ts
@@ -1,7 +1,7 @@
 import * as THREE from "three";
 import { supported } from "@mapbox/mapbox-gl-supported";
 
-import endPortalUrl from "./end_portal.png";
+import endPortalUrl from "./end-portal.png";
 
 const vertShader = `
 varying vec3 v_normal;
diff --git a/ts/end-portal.png b/ts/end-portal.png
new file mode 100644
index 0000000..a083a52
Binary files /dev/null and b/ts/end-portal.png differ
diff --git a/ts/end_portal.png b/ts/end_portal.png
deleted file mode 100644
index 173731a..0000000
Binary files a/ts/end_portal.png and /dev/null differ