diff --git a/src/telepathy/bot.cr b/src/telepathy/bot.cr
index fad0088..ad530c7 100644
--- a/src/telepathy/bot.cr
+++ b/src/telepathy/bot.cr
@@ -79,8 +79,9 @@ module Telepathy
                         when String
                             formdata.field("photo", photo.as(String))
                         when File
-                            formdata.file("photo", photo.as(IO),
-                                          HTTP::FormData::FileMetadata.new(filename: File.basename(photo.path)))
+                            photo_file = photo.as(File)
+                            formdata.file("photo", photo_file,
+                                          HTTP::FormData::FileMetadata.new(filename: File.basename(photo_file.path)))
                         end
                     end