diff --git a/servant-client/servant-client.cabal b/servant-client/servant-client.cabal
index 4b660387..7f4ef1a6 100644
--- a/servant-client/servant-client.cabal
+++ b/servant-client/servant-client.cabal
@@ -129,3 +129,4 @@ test-suite readme
   build-depends:  base, servant, http-client, text, servant-client, markdown-unlit
   build-tool-depends: markdown-unlit:markdown-unlit
   ghc-options:    -pgmL markdown-unlit
+  default-language: Haskell2010