diff --git a/pkgs/tools/misc/aichat/default.nix b/pkgs/tools/misc/aichat/default.nix
index 6bd57a6e8e96..5052c38b5f2d 100644
--- a/pkgs/tools/misc/aichat/default.nix
+++ b/pkgs/tools/misc/aichat/default.nix
@@ -4,6 +4,7 @@
 , rustPlatform
 , fetchFromGitHub
 , pkg-config
+, installShellFiles
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -21,6 +22,7 @@ rustPlatform.buildRustPackage rec {
 
   nativeBuildInputs = [
     pkg-config
+    installShellFiles
   ];
 
   buildInputs = lib.optionals stdenv.isDarwin [
@@ -29,6 +31,10 @@ rustPlatform.buildRustPackage rec {
     darwin.apple_sdk.frameworks.Security
   ];
 
+  postInstall = ''
+    installShellCompletion ./scripts/completions/aichat.{bash,fish,zsh}
+  '';
+
   meta = with lib; {
     description = "Use GPT-4(V), Gemini, LocalAI, Ollama and other LLMs in the terminal";
     homepage = "https://github.com/sigoden/aichat";