diff --git a/gmail-simple.cabal b/gmail-simple.cabal
--- a/gmail-simple.cabal
+++ b/gmail-simple.cabal
@@ -1,15 +1,16 @@
 name: gmail-simple
-version: 0.1.0.0
+version: 0.1.0.1
 synopsis: Simple library for Google Mail (GMail).
 description:
   Easy-to-use library to interact with the Google Mail API.
   .
-  Current only supporting sending mails.
+  Currently only supporting sending mails.
 category: Email, Google
 license: BSD3
 license-file: LICENSE
 bug-reports: https://github.com/Daniel-Diaz/gmail-simple/issues
 homepage: https://github.com/Daniel-Diaz/gmail-simple/blob/main/README.md
+maintainer: Daniel Casanueva
 build-type: Simple
 cabal-version: >= 1.10
 extra-source-files:
diff --git a/src/Network/GMail/Simple.hs b/src/Network/GMail/Simple.hs
--- a/src/Network/GMail/Simple.hs
+++ b/src/Network/GMail/Simple.hs
@@ -1,6 +1,5 @@
 
 {-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE TypeApplications #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE FlexibleInstances #-}
 
@@ -251,7 +250,7 @@
         [ "From: " <> mail_sender mail <> " <" <> mailAddressText sender <> ">\r\n"
         , "To: " <> mailAddressText (mail_recipient mail) <> "\r\n"
         , "Subject: " <> mail_subject mail <> "\r\n"
-        , "Content-Type: " <> decodeUtf8 (Media.renderHeader $ mailContentType (Proxy @ a)) <> "\r\n"
+        , "Content-Type: " <> decodeUtf8 (Media.renderHeader $ mailContentType (Proxy :: Proxy a)) <> "\r\n"
         , "\r\n"
         , toMailBody $ mail_body mail
           ]