diff --git a/pkgs/development/tools/ruff/default.nix b/pkgs/development/tools/ruff/default.nix
index 89bd9348491d..6a68f3a7b820 100644
--- a/pkgs/development/tools/ruff/default.nix
+++ b/pkgs/development/tools/ruff/default.nix
@@ -64,7 +64,7 @@ rustPlatform.buildRustPackage rec {
     "--skip=semantic::types::infer::tests::resolve_visible_def"
   ];
 
-  postInstall = ''
+  postInstall = lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
     installShellCompletion --cmd ruff \
       --bash <($out/bin/ruff generate-shell-completion bash) \
       --fish <($out/bin/ruff generate-shell-completion fish) \