diff --git a/pkgs/development/interpreters/ruby/build-ruby-gem/default.nix b/pkgs/development/interpreters/ruby/build-ruby-gem/default.nix
index fc9f0656cd9..cc1f85de19d 100644
--- a/pkgs/development/interpreters/ruby/build-ruby-gem/default.nix
+++ b/pkgs/development/interpreters/ruby/build-ruby-gem/default.nix
@@ -91,7 +91,7 @@ stdenv.mkDerivation (attrs // {
     ++ lib.optional stdenv.isDarwin darwin.libobjc
     ++ buildInputs;
 
-  name = attrs.name or (namePrefix + gemName);
+  name = attrs.name or "${namePrefix}${gemName}-${version}";
 
   inherit src;