diff --git a/derivations.nix b/derivations.nix
index 95c49f6..e63f131 100644
--- a/derivations.nix
+++ b/derivations.nix
@@ -21,7 +21,7 @@ rec {
     cmakeFlags = oa.cmakeFlags ++ ["-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=RISCV"];
   });
   rustc = (pkgs.rustc.overrideAttrs(oa: {
-    name = oa.name + "-riscv";
+    name = "${oa.pname}-${oa.version}-riscv";
     patches = oa.patches ++ [ ./compilers/rustc-riscv32i.patch ];
   })).override { inherit llvm_7; };
   rust-riscv32i-crates = pkgs.callPackage ./compilers/rust-riscv32i-crates.nix { inherit rustc; };