diff --git a/pkgs/by-name/di/diskscan/package.nix b/pkgs/by-name/di/diskscan/package.nix
index bbb737a7d498..ba2129763486 100644
--- a/pkgs/by-name/di/diskscan/package.nix
+++ b/pkgs/by-name/di/diskscan/package.nix
@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch,
   cmake,
   ncurses,
   zlib,
@@ -18,6 +19,16 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-2y1ncPg9OKxqImBN5O5kXrTsuwZ/Cg/8exS7lWyZY1c=";
   };
 
+  patches = [
+    # cmake-4 support:
+    #   https://github.com/baruch/diskscan/pull/77
+    (fetchpatch {
+      name = "cmake-4.patch";
+      url = "https://github.com/baruch/diskscan/commit/6e342469dcab32be7a33109a4d394141d5c905b5.patch";
+      hash = "sha256-05ctYPmGWTJRUc4aN35fvb0ITwIZlQdIweH7tSQ0RjA=";
+    })
+  ];
+
   buildInputs = [
     ncurses
     zlib