diff --git a/pkgs/by-name/cn/cnsprcy/package.nix b/pkgs/by-name/cn/cnsprcy/package.nix
index 662df4a1f5ca..4e4f8778bef4 100644
--- a/pkgs/by-name/cn/cnsprcy/package.nix
+++ b/pkgs/by-name/cn/cnsprcy/package.nix
@@ -22,7 +22,7 @@ rustPlatform.buildRustPackage (finalAttrs: {
 
   passthru.updateScript = ./update.sh;
 
-  RUSTC_BOOTSTRAP = true;
+  env.RUSTC_BOOTSTRAP = true;
   buildInputs = [ sqlite ];
 
   meta = {