diff --git a/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix b/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix
index 1ef275d8c26..48529707ce4 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix
@@ -246,6 +246,10 @@ self: super: {
     url = "https://patch-diff.githubusercontent.com/raw/haskell/ghc-events/pull/8.patch";
     sha256 = "1k881jrvzfvs761jgfhf5nsbmbc33c9333l4s0f5088p46ff2n1l";
   });
+  dependent-sum-template = appendPatch super.dependent-sum-template (pkgs.fetchpatch {
+    url = "https://patch-diff.githubusercontent.com/raw/mokus0/dependent-sum-template/pull/4.patch";
+    sha256 = "1yb1ny4ckl4d3sf4xnvpbsa9rw2dficzgipijs5s3729dnsc3rb0";
+  });
   mueval = appendPatch super.mueval (pkgs.fetchpatch {
     url = "https://patch-diff.githubusercontent.com/raw/gwern/mueval/pull/10.patch";
     sha256 = "1gs8p89d1qsrd1qycbhf6kv4qw0sbb8m6dy106dqkmdzcjzcyq74";