diff --git a/servant/src/Servant/API/ResponseHeaders.hs b/servant/src/Servant/API/ResponseHeaders.hs
index 015a83d7..49ebd6c6 100644
--- a/servant/src/Servant/API/ResponseHeaders.hs
+++ b/servant/src/Servant/API/ResponseHeaders.hs
@@ -28,6 +28,7 @@ module Servant.API.ResponseHeaders
     , noHeader
     , BuildHeadersTo(buildHeadersTo)
     , GetHeaders(getHeaders)
+    , GetHeaders'
     , HeaderValMap
     , HList(..)
     ) where