diff --git a/servant-docs.cabal b/servant-docs.cabal
index 48e5271c..050d1a2c 100644
--- a/servant-docs.cabal
+++ b/servant-docs.cabal
@@ -45,5 +45,5 @@ executable greet-docs
   main-is: greet.hs
   hs-source-dirs: example
   ghc-options: -Wall
-  build-depends: base, aeson, servant, servant-docs, string-conversions, text
+  build-depends: base, aeson, lens, servant, servant-docs, string-conversions, text
   default-language: Haskell2010