diff --git a/pkgs/by-name/fl/flare/engine.nix b/pkgs/by-name/fl/flare/engine.nix
index d466f032dd8c..bfa24d0e9469 100644
--- a/pkgs/by-name/fl/flare/engine.nix
+++ b/pkgs/by-name/fl/flare/engine.nix
@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch,
   cmake,
   SDL2,
   SDL2_image,
@@ -20,7 +21,16 @@ stdenv.mkDerivation rec {
     hash = "sha256-DIzfTqwZJ8NAPB/TWzvPjepHb7hIbIr+Kk+doXJmpLc=";
   };
 
-  patches = [ ./desktop.patch ];
+  patches = [
+    ./desktop.patch
+
+    # cmake-4 compatibility patch
+    (fetchpatch {
+      name = "cmake-4.patch";
+      url = "https://github.com/flareteam/flare-engine/commit/9500379f886484382bba2f893faf49865de9f2c0.patch";
+      hash = "sha256-nUn54ZBEvvFkIhzE/UBbsvF0rFC9JAeQACTAPtsc1VI=";
+    })
+  ];
 
   nativeBuildInputs = [ cmake ];
   buildInputs = [
diff --git a/pkgs/by-name/fl/flare/game.nix b/pkgs/by-name/fl/flare/game.nix
index e726d3a290e0..59bd9a52d19d 100644
--- a/pkgs/by-name/fl/flare/game.nix
+++ b/pkgs/by-name/fl/flare/game.nix
@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch,
   cmake,
 }:
 
@@ -16,6 +17,15 @@ stdenv.mkDerivation rec {
     hash = "sha256-tINIwxyQn8eeJCHwRmAMo2TYRgrgJlGaUrnrgbmM3Jo=";
   };
 
+  patches = [
+    # cmake-4 compatibility patch
+    (fetchpatch {
+      name = "cmake-4.patch";
+      url = "https://github.com/flareteam/flare-game/commit/5b61dfd69f4ecbaca6439caa9ae41b3168e4d21a.patch";
+      hash = "sha256-5Um6LWAWQyialzO3KSebmLju0VOuz1S5dzavO9EWlLE=";
+    })
+  ];
+
   nativeBuildInputs = [ cmake ];
 
   meta = {