diff --git a/packages/@uppy/tus/src/index.ts b/packages/@uppy/tus/src/index.ts
index 399fa135fb..eba999df58 100644
--- a/packages/@uppy/tus/src/index.ts
+++ b/packages/@uppy/tus/src/index.ts
@@ -53,7 +53,7 @@ export interface TusOpts<M extends Meta, B extends Body>
     err: tus.DetailedError,
     retryAttempt: number,
     options: TusOpts<M, B>,
-    next: (e: tus.DetailedError) => void,
+    next: (e: tus.DetailedError) => boolean,
   ) => boolean
   retryDelays?: number[]
   withCredentials?: boolean