diff --git a/pkgs/development/libraries/haskell/iCalendar/default.nix b/pkgs/development/libraries/haskell/iCalendar/default.nix
index 867474fdfb93..635254bca75c 100644
--- a/pkgs/development/libraries/haskell/iCalendar/default.nix
+++ b/pkgs/development/libraries/haskell/iCalendar/default.nix
@@ -1,7 +1,7 @@
 # This file was auto-generated by cabal2nix. Please do NOT edit manually!
 
 { cabal, base64Bytestring, caseInsensitive, dataDefault, mime, mtl
-, network, parsec, text, time
+, network, networkUri, parsec, text, time, fetchpatch
 }:
 
 cabal.mkDerivation (self: {
@@ -10,7 +10,13 @@ cabal.mkDerivation (self: {
   sha256 = "08m47nxxz70lmmndlgycfb27x8xfwakxi8izbba0f6w23ddaljp3";
   buildDepends = [
     base64Bytestring caseInsensitive dataDefault mime mtl network
-    parsec text time
+    networkUri parsec text time
+  ];
+  patches = [
+    (fetchpatch {
+      url = "https://github.com/tingtun/iCalendar/pull/14.patch";
+      sha256 = "0pyzlshckvbqns3yryh9pm5r3n2hpqx0c2i3niyqsh6a1lk9hc5m";
+    })
   ];
   meta = {
     homepage = "http://github.com/tingtun/iCalendar";
@@ -18,6 +24,5 @@ cabal.mkDerivation (self: {
     license = self.stdenv.lib.licenses.bsd3;
     platforms = self.ghc.meta.platforms;
     maintainers = with self.stdenv.lib.maintainers; [ ocharles ];
-    broken = true;
   };
 })