diff --git a/pkgs/development/interpreters/ruby/load-ruby-env.nix b/pkgs/development/interpreters/ruby/load-ruby-env.nix
index 1a28e1cd047..8bf0db76d07 100644
--- a/pkgs/development/interpreters/ruby/load-ruby-env.nix
+++ b/pkgs/development/interpreters/ruby/load-ruby-env.nix
@@ -31,6 +31,7 @@
 let
   const = x: y: x;
 
+  fetchers.path = attrs: attrs.src.path;
   fetchers.gem = attrs: fetchurl {
     url = "${attrs.src.source or "https://rubygems.org"}/downloads/${attrs.name}-${attrs.version}.gem";
     inherit (attrs.src) sha256;