diff --git a/pkgs/development/beam-modules/fetch-hex.nix b/pkgs/development/beam-modules/fetch-hex.nix
index 2d1fa623745a..a8241892ee0c 100644
--- a/pkgs/development/beam-modules/fetch-hex.nix
+++ b/pkgs/development/beam-modules/fetch-hex.nix
@@ -7,7 +7,7 @@
 }:
 
 stdenv.mkDerivation ({
-  pname = "hex-source-${pkg}";
+  pname = pkg;
   inherit version;
   dontBuild = true;
   dontConfigure = true;