diff --git a/pkgs/by-name/no/noctalia/package.nix b/pkgs/by-name/no/noctalia/package.nix
index 94f7de1874a5..cd253f686ae0 100644
--- a/pkgs/by-name/no/noctalia/package.nix
+++ b/pkgs/by-name/no/noctalia/package.nix
@@ -127,7 +127,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   mesonBuildType = "release";
 
-  postInstall = ''
+  postInstall = lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
     installShellCompletion --cmd noctalia \
       --bash <($out/bin/noctalia completions bash) \
       --fish <($out/bin/noctalia completions fish) \