diff --git a/pkgs/by-name/dd/ddate/package.nix b/pkgs/by-name/dd/ddate/package.nix
index ad7f2752ee40..082059291c93 100644
--- a/pkgs/by-name/dd/ddate/package.nix
+++ b/pkgs/by-name/dd/ddate/package.nix
@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch,
   cmake,
 }:
 
@@ -16,6 +17,15 @@ stdenv.mkDerivation rec {
     sha256 = "1qchxnxvghbma6gp1g78wnjxsri0b72ha9axyk31cplssl7yn73f";
   };
 
+  patches = [
+    # cmake-4 compatibility
+    (fetchpatch {
+      name = "cmake-4.patch";
+      url = "https://github.com/bo0ts/ddate/commit/0fbae46cb004c0acc48982b8e3533556d7b2edcc.patch?full_index=1";
+      hash = "sha256-EbOmZYhFN8t8E/GW9ctcvhYfQauGZnX+5ZQmrEl6F18=";
+    })
+  ];
+
   nativeBuildInputs = [ cmake ];
 
   meta = with lib; {