diff --git a/templates/chisel/nix/gcd/gcd.nix b/templates/chisel/nix/gcd/gcd.nix
index 42dd4bb..748e875 100644
--- a/templates/chisel/nix/gcd/gcd.nix
+++ b/templates/chisel/nix/gcd/gcd.nix
@@ -75,7 +75,10 @@ let
       projectDependencies.setupHook
     ];
 
-    env.CIRCT_INSTALL_PATH = circt-full;
+    env = {
+      CIRCT_INSTALL_PATH = circt-full;
+      JEXTRACT_INSTALL_PATH = jextract-21;
+    };
 
     outputs = [ "out" "elaborator" ];