diff --git a/lib/rubygems/source/lock.rb b/lib/rubygems/source/lock.rb
index 86b16e964c6c..59717be2c0be 100644
--- a/lib/rubygems/source/lock.rb
+++ b/lib/rubygems/source/lock.rb
@@ -34,6 +34,10 @@ def == other # :nodoc:
     0 == (self <=> other)
   end
 
+  def hash # :nodoc:
+    @wrapped.hash ^ 3
+  end
+
   ##
   # Delegates to the wrapped source's fetch_spec method.
 
@@ -46,4 +50,3 @@ def uri # :nodoc:
   end
 
 end
-