diff --git a/pkgs/shells/nix-zsh-completions/default.nix b/pkgs/shells/nix-zsh-completions/default.nix
index 5faca2fa8e8..1261a4429a4 100644
--- a/pkgs/shells/nix-zsh-completions/default.nix
+++ b/pkgs/shells/nix-zsh-completions/default.nix
@@ -1,13 +1,17 @@
 { stdenv, fetchFromGitHub }:
 
+let
+  version = "0.3.1";
+in
+
 stdenv.mkDerivation rec {
-  name = "nix-zsh-completions";
+  name = "nix-zsh-completions-${version}";
 
   src = fetchFromGitHub {
     owner = "spwhitt";
     repo = "nix-zsh-completions";
-    rev = "0.3";
-    sha256 = "1vwkd4nppjrvy6xb0vx4z73awrhaah1433dp6h4ghi3cdrrjn7ri";
+    rev = "${version}";
+    sha256 = "1sbc52f5818bcygljrji84dyvgw727x50m9v6qfrsdaji3zkqga1";
   };
 
   installPhase = ''