diff --git a/servant-js/src/Servant/JS.hs b/servant-js/src/Servant/JS.hs
index 708847f3..db821ffe 100644
--- a/servant-js/src/Servant/JS.hs
+++ b/servant-js/src/Servant/JS.hs
@@ -76,7 +76,7 @@ module Servant.JS
   , JavaScriptGenerator
 
   , -- * Options common to all generators
-    CommonGeneratorOptions
+    CommonGeneratorOptions(..)
   , defCommonGeneratorOptions
 
   , -- * Function renamers