diff --git a/pkgs/development/tools/jtc/default.nix b/pkgs/development/tools/jtc/default.nix
index 947f26664f4d..c8a13c07cb60 100644
--- a/pkgs/development/tools/jtc/default.nix
+++ b/pkgs/development/tools/jtc/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub }:
+{ lib, stdenv, fetchFromGitHub, fetchpatch }:
 
 stdenv.mkDerivation rec {
   pname = "jtc";
@@ -11,6 +11,14 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-VATRlOOV4wBInLOm9J0Dp2vhtL5mb0Yxdl/ya0JiqEU=";
   };
 
+  patches = [
+    # Fix building with Clang. Removing with next release.
+    (fetchpatch {
+      url = "https://github.com/ldn-softdev/jtc/commit/92a5116e5524c0b6d2f539db7b5cc9fdd7c5b8ab.patch";
+      sha256 = "sha256-AAvDH0XsT8/CAguG611/odg0m1HR+veC0jbAw6KLHLM=";
+    })
+  ];
+
   buildPhase = ''
     runHook preBuild