diff --git a/types/blueimp-load-image/index.d.ts b/types/blueimp-load-image/index.d.ts
index 3c12172d73..3a083f206f 100644
--- a/types/blueimp-load-image/index.d.ts
+++ b/types/blueimp-load-image/index.d.ts
@@ -114,7 +114,7 @@ interface LoadImage  {
         data?: ImageHead,
     ) => void;
 
-    blobSlice: (file: Blob, start?: number, end?: number) => Blob;
+    blobSlice: (this: Blob, start?: number, end?: number) => Blob;
 }
 
 declare const loadImage: LoadImage;