diff --git a/pkgs/applications/version-management/monotone/botan2.nix b/pkgs/applications/version-management/monotone/botan2.nix
index 0c89c5f7bf1f..e97561f0a058 100644
--- a/pkgs/applications/version-management/monotone/botan2.nix
+++ b/pkgs/applications/version-management/monotone/botan2.nix
@@ -33,6 +33,10 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-3+6g4KbybWckxK8B2pp7iEh62y2Bunxy/K9S21IsmtQ=";
   };
 
+  postPatch = ''
+    sed -e '1i#include <cstdint>' -i src/cli/cli.h
+  '';
+
   nativeBuildInputs = [
     python3
     docutils