diff --git a/pkgs/development/compilers/dotnet/build-dotnet.nix b/pkgs/development/compilers/dotnet/build-dotnet.nix
index f8cf3d302ec4..05bbcd092857 100644
--- a/pkgs/development/compilers/dotnet/build-dotnet.nix
+++ b/pkgs/development/compilers/dotnet/build-dotnet.nix
@@ -105,8 +105,18 @@ stdenv.mkDerivation rec {
     export DOTNET_CLI_TELEMETRY_OPTOUT=1
   '';
 
-  passthru = {
+  passthru = rec {
     inherit icu packages;
+
+    runtimeIdentifierMap = {
+      "x86_64-linux" = "linux-x64";
+      "aarch64-linux" = "linux-arm64";
+      "x86_64-darwin" = "osx-x64";
+      "aarch64-darwin" = "osx-arm64";
+    };
+
+    # Convert a "stdenv.hostPlatform.system" to a dotnet RID
+    systemToDotnetRid = system: runtimeIdentifierMap.${system} or (throw "unsupported platform ${system}");
   };
 
   meta = with lib; {