diff --git a/.travis.yml b/.travis.yml
index 62501f7a..9cddf7ab 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -25,7 +25,7 @@ install:
   - sed -i 's/^jobs:/-- jobs:/' ${HOME}/.cabal/config
 
 script:
-  - for package in $(cat sources.txt); do (cd $package && tinc && cabal configure --enable-tests --disable-optimization && cabal build && cabal test) || exit 1; done
+  - for package in $(cat sources.txt); do (echo testing $package && cd $package && tinc && cabal configure --enable-tests --disable-optimization && cabal build && cabal test) || exit 1; done
 
 cache:
   directories:
diff --git a/servant-client/test/Servant/ClientSpec.hs b/servant-client/test/Servant/ClientSpec.hs
index 0fbc053b..0243cc36 100644
--- a/servant-client/test/Servant/ClientSpec.hs
+++ b/servant-client/test/Servant/ClientSpec.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE CPP                    #-}
+{-# LANGUAGE ConstraintKinds        #-}
 {-# LANGUAGE DataKinds              #-}
 {-# LANGUAGE DeriveGeneric          #-}
 {-# LANGUAGE FlexibleContexts       #-}
diff --git a/servant-server/servant-server.cabal b/servant-server/servant-server.cabal
index d0d0e2a3..cdf57944 100644
--- a/servant-server/servant-server.cabal
+++ b/servant-server/servant-server.cabal
@@ -49,7 +49,7 @@ library
       , attoparsec         >= 0.12 && < 0.14
       , bytestring         >= 0.10 && < 0.11
       , containers         >= 0.5  && < 0.6
-      , deepseq            == 1.4.*
+      , deepseq            == 1.4.* || == 1.3.*
       , http-api-data      >= 0.1  && < 0.3
       , http-types         >= 0.8  && < 0.10
       , network-uri        >= 2.6  && < 2.7
diff --git a/servant-server/src/Servant/Server.hs b/servant-server/src/Servant/Server.hs
index c557785e..fac86621 100644
--- a/servant-server/src/Servant/Server.hs
+++ b/servant-server/src/Servant/Server.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE ConstraintKinds   #-}
 {-# LANGUAGE FlexibleContexts  #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE TypeFamilies      #-}
diff --git a/servant-server/src/Servant/Server/Internal.hs b/servant-server/src/Servant/Server/Internal.hs
index 86c56b32..cae4815a 100644
--- a/servant-server/src/Servant/Server/Internal.hs
+++ b/servant-server/src/Servant/Server/Internal.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE CPP                        #-}
+{-# LANGUAGE ConstraintKinds            #-}
 {-# LANGUAGE DataKinds                  #-}
 {-# LANGUAGE FlexibleContexts           #-}
 {-# LANGUAGE FlexibleInstances          #-}