diff --git a/lib/systems/default.nix b/lib/systems/default.nix
index 0d21175914a3..9eec21cbf21b 100644
--- a/lib/systems/default.nix
+++ b/lib/systems/default.nix
@@ -324,7 +324,8 @@ rec {
               "riscv64" = "riscv64gc";
             }.${cpu.name} or cpu.name;
             vendor_ = final.rust.platform.vendor;
-          in rust.config
+          # TODO: deprecate args.rustc in favour of args.rust after 23.05 is EOL.
+          in args.rust.rustcTarget or args.rustc.config
             or "${cpu_}-${vendor_}-${kernel.name}${lib.optionalString (abi.name != "unknown") "-${abi.name}"}";
 
           # The name of the rust target if it is standard, or the json file