diff --git a/zipfs/file.go b/zipfs/file.go
index a81ea064..acac665d 100644
--- a/zipfs/file.go
+++ b/zipfs/file.go
@@ -33,7 +33,8 @@ func (f *File) fillBuffer(offset int64) (err error) {
 		return
 	}
 	buf := make([]byte, int(offset)-len(f.buf))
-	n, _ := io.ReadFull(f.reader, buf)
+	var n int
+	n, err = io.ReadFull(f.reader, buf)
 	if n > 0 {
 		f.buf = append(f.buf, buf[:n]...)
 	}