diff --git a/pkgs/tools/misc/tmux-sessionizer/default.nix b/pkgs/tools/misc/tmux-sessionizer/default.nix
index e60ef9fb4c50..2d2deb07dbd2 100644
--- a/pkgs/tools/misc/tmux-sessionizer/default.nix
+++ b/pkgs/tools/misc/tmux-sessionizer/default.nix
@@ -7,11 +7,12 @@
 , Security
 , testers
 , tmux-sessionizer
+, installShellFiles
 }:
 let
 
   name = "tmux-sessionizer";
-  version = "0.4.3";
+  version = "0.4.4";
 
 in
 rustPlatform.buildRustPackage {
@@ -22,10 +23,10 @@ rustPlatform.buildRustPackage {
     owner = "jrmoulton";
     repo = name;
     rev = "v${version}";
-    hash = "sha256-wwu3h2eQrim/RbxTYqt+EnFmn0uD6PQzo1Xs1qCVQ3o=";
+    hash = "sha256-4xwpenoAVGKdVO3eSS4BhaEcwpNPGA5Ozie53focDlA=";
   };
 
-  cargoHash = "sha256-5OIiDz66GD3DrNKzxH+bpyweS7Ycn2IOf4f9mdHAaCo=";
+  cargoHash = "sha256-ajeCB1w/JHMT5e7mSwsh++lzLNfp0qfutONStpJpFDo=";
 
   passthru.tests.version = testers.testVersion {
     package = tmux-sessionizer;
@@ -35,9 +36,16 @@ rustPlatform.buildRustPackage {
   # Needed to get openssl-sys to use pkg-config.
   OPENSSL_NO_VENDOR = 1;
 
-  nativeBuildInputs = [ pkg-config ];
+  nativeBuildInputs = [ pkg-config installShellFiles ];
   buildInputs = [ openssl ] ++ lib.optionals stdenv.hostPlatform.isDarwin [ Security ];
 
+  postInstall = lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
+    installShellCompletion --cmd tms \
+      --bash <($out/bin/tms --generate bash) \
+      --fish <($out/bin/tms --generate fish) \
+      --zsh <($out/bin/tms --generate zsh)
+  '';
+
   meta = with lib; {
     description = "Fastest way to manage projects as tmux sessions";
     homepage = "https://github.com/jrmoulton/tmux-sessionizer";