diff --git a/pkgs/by-name/gi/git-town/package.nix b/pkgs/by-name/gi/git-town/package.nix
index 95bcf73dcdd4..8456432c6c71 100644
--- a/pkgs/by-name/gi/git-town/package.nix
+++ b/pkgs/by-name/gi/git-town/package.nix
@@ -1,5 +1,6 @@
 {
   lib,
+  stdenv,
   buildGoModule,
   fetchFromGitHub,
   installShellFiles,
@@ -64,14 +65,16 @@ buildGoModule rec {
     in
     [ "-skip=^${builtins.concatStringsSep "$|^" skippedTests}$" ];
 
-  postInstall = ''
-    installShellCompletion --cmd git-town \
-      --bash <($out/bin/git-town completions bash) \
-      --fish <($out/bin/git-town completions fish) \
-      --zsh <($out/bin/git-town completions zsh)
-
-    wrapProgram $out/bin/git-town --prefix PATH : ${lib.makeBinPath [ git ]}
-  '';
+  postInstall =
+    lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
+      installShellCompletion --cmd git-town \
+        --bash <($out/bin/git-town completions bash) \
+        --fish <($out/bin/git-town completions fish) \
+        --zsh <($out/bin/git-town completions zsh)
+    ''
+    + ''
+      wrapProgram $out/bin/git-town --prefix PATH : ${lib.makeBinPath [ git ]}
+    '';
 
   passthru.tests.version = testers.testVersion {
     package = git-town;