diff --git a/index.d.ts b/index.d.ts
index fdf6f905..42ef9e59 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -56,7 +56,7 @@ declare module 'react-native-document-picker' {
     copyError?: string;
     type: string;
     name: string;
-    size: string;
+    size: number;
   }
   type Platform = 'ios' | 'android' | 'windows';
   export default class DocumentPicker<OS extends keyof PlatformTypes = Platform> {