diff --git a/pkgs/by-name/ct/ctodo/package.nix b/pkgs/by-name/ct/ctodo/package.nix
index c70ac00b5b4a..de52369f8e70 100644
--- a/pkgs/by-name/ct/ctodo/package.nix
+++ b/pkgs/by-name/ct/ctodo/package.nix
@@ -24,6 +24,12 @@ stdenv.mkDerivation rec {
     readline
   ];
 
+  postPatch = ''
+    substituteInPlace CMakeLists.txt --replace-fail \
+      'cmake_minimum_required(VERSION 2.6)' \
+      'cmake_minimum_required(VERSION 3.5)'
+  '';
+
   meta = with lib; {
     homepage = "http://ctodo.apakoh.dk/";
     description = "Simple ncurses-based task list manager";