diff --git a/lib/pry/rbx_path.rb b/lib/pry/rbx_path.rb
index bb3520bc..b3d4fa01 100644
--- a/lib/pry/rbx_path.rb
+++ b/lib/pry/rbx_path.rb
@@ -2,33 +2,19 @@ class Pry
   module RbxPath
     module_function
     def is_core_path?(path)
-      path.start_with?("kernel")
+      path.start_with?("kernel") || path.start_with?("lib")
     end
 
     def convert_path_to_full(path)
-      if rvm_ruby?(Rubinius::BIN_PATH)
-        rvm_convert_path_to_full(path)
-      else
-        std_convert_path_to_full(path)
+      if path.start_with?("kernel")
+        File.join File.dirname(Rubinius::KERNEL_PATH), path
+      elsif path.start_with?("lib")
+        File.join File.dirname(Rubinius::LIB_PATH), path
       end
     end
 
     def rvm_ruby?(path)
       !!(path =~ /\.rvm/)
     end
-
-    def rvm_convert_path_to_full(path)
-      ruby_name = File.dirname(Rubinius::BIN_PATH).split("/").last
-      source_path = File.join(File.dirname(File.dirname(File.dirname(Rubinius::BIN_PATH))),  "src", ruby_name)
-      file_name = File.join(source_path, path)
-      raise "Cannot find rbx core source" if !File.exists?(file_name)
-      file_name
-    end
-
-    def std_convert_path_to_full(path)
-      file_name = File.join(Rubinius::BIN_PATH, "..", path)
-      raise "Cannot find rbx core source" if !File.exists?(file_name)
-      file_name
-    end
   end
 end