diff --git a/pkgs/development/beam-modules/hex/default.nix b/pkgs/development/beam-modules/hex/default.nix
index d0af0b59c9f9..7e91153bed51 100644
--- a/pkgs/development/beam-modules/hex/default.nix
+++ b/pkgs/development/beam-modules/hex/default.nix
@@ -7,13 +7,13 @@ let
   };
 
   pkg = self: stdenv.mkDerivation rec {
-    name = "hex";
-    version = "v0.17.1";
+    pname = "hex";
+    version = "0.17.1";
 
     src = fetchFromGitHub {
         owner = "hexpm";
         repo = "hex";
-        rev = "${version}";
+        rev = "v${version}";
         sha256 = "1s4asar1mcavzj3w37jcz243ka0z5jm0r42yws3h4aagawxxg02z";
     };