diff --git a/source/Network/Xmpp/Sasl/Common.hs b/source/Network/Xmpp/Sasl/Common.hs
index b2b4e47..bc27044 100644
--- a/source/Network/Xmpp/Sasl/Common.hs
+++ b/source/Network/Xmpp/Sasl/Common.hs
@@ -1,6 +1,7 @@
 {-# OPTIONS_HADDOCK hide #-}
 {-# LANGUAGE PatternGuards #-}
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE FlexibleContexts #-}
 
 module Network.Xmpp.Sasl.Common where
 
diff --git a/source/Network/Xmpp/Tls.hs b/source/Network/Xmpp/Tls.hs
index 3926c84..d21f5db 100644
--- a/source/Network/Xmpp/Tls.hs
+++ b/source/Network/Xmpp/Tls.hs
@@ -2,6 +2,7 @@
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PackageImports #-}
+{-# LANGUAGE FlexibleContexts #-}
 
 module Network.Xmpp.Tls where