diff --git a/pkgs/development/python-modules/trezor/default.nix b/pkgs/development/python-modules/trezor/default.nix
index e7bec00863ae..e16f4027ce54 100644
--- a/pkgs/development/python-modules/trezor/default.nix
+++ b/pkgs/development/python-modules/trezor/default.nix
@@ -12,6 +12,7 @@
 , rlp
 , shamir-mnemonic
 , trezor-udev-rules
+, installShellFiles
 }:
 
 buildPythonPackage rec {
@@ -25,6 +26,8 @@ buildPythonPackage rec {
     sha256 = "0ycmpwjv5xp25993divjhaq5j766zgcy22xx39xfc1pcvldq5g7n";
   };
 
+  nativeBuildInputs = [ installShellFiles ];
+
   propagatedBuildInputs = [ typing-extensions protobuf hidapi ecdsa mnemonic requests pyblake2 click construct libusb1 rlp shamir-mnemonic trezor-udev-rules ];
 
   checkInputs = [
@@ -38,6 +41,16 @@ buildPythonPackage rec {
     runHook postCheck
   '';
 
+  postFixup = ''
+    mkdir completions
+    _TREZORCTL_COMPLETE=source_bash $out/bin/trezorctl > completions/trezorctl || true
+    _TREZORCTL_COMPLETE=source_zsh $out/bin/trezorctl > completions/_trezorctl || true
+    _TREZORCTL_COMPLETE=source_fish $out/bin/trezorctl > completions/trezorctl.fish || true
+    installShellCompletion --bash completions/trezorctl
+    installShellCompletion --zsh completions/_trezorctl
+    installShellCompletion --fish completions/trezorctl.fish
+  '';
+
   meta = with lib; {
     description = "Python library for communicating with TREZOR Bitcoin Hardware Wallet";
     homepage = "https://github.com/trezor/trezor-firmware/tree/master/python";