diff --git a/pkgs/development/libraries/haskell/snap/snap.nix b/pkgs/development/libraries/haskell/snap/snap.nix
index 97e4a4d67a5d..435bccd9cb5d 100644
--- a/pkgs/development/libraries/haskell/snap/snap.nix
+++ b/pkgs/development/libraries/haskell/snap/snap.nix
@@ -20,6 +20,9 @@ cabal.mkDerivation (self: {
     unorderedContainers vector vectorAlgorithms xmlhtml
   ];
   jailbreak = true;
+  patchPhase = ''
+    sed -i -e 's|lens .*< 4.2|lens|' snap.cabal
+  '';
   meta = {
     homepage = "http://snapframework.com/";
     description = "Top-level package for the Snap Web Framework";