diff --git a/pkgs/development/interpreters/ruby/ruby-2.2.0.nix b/pkgs/development/interpreters/ruby/ruby-2.2.0.nix
index 516f30e9680..9a22a75e621 100644
--- a/pkgs/development/interpreters/ruby/ruby-2.2.0.nix
+++ b/pkgs/development/interpreters/ruby/ruby-2.2.0.nix
@@ -99,7 +99,8 @@ stdenv.mkDerivation rec {
     minorVersion = "2";
     teenyVersion = "0";
     patchLevel = "0";
-    libPath = "lib/ruby/${majorVersion}.${minorVersion}";
-    gemPath = "lib/ruby/gems/${majorVersion}.${minorVersion}";
+    rubyEngine = "ruby";
+    libPath = "lib/${rubyEngine}/${majorVersion}.${minorVersion}.${teenyVersion}";
+    gemPath = "lib/${rubyEngine}/gems/${majorVersion}.${minorVersion}.${teenyVersion}";
   };
 }