diff --git a/activesupport/lib/active_support/cache/memory_store.rb b/activesupport/lib/active_support/cache/memory_store.rb
index e0aba6b19a063..4872e025cd307 100644
--- a/activesupport/lib/active_support/cache/memory_store.rb
+++ b/activesupport/lib/active_support/cache/memory_store.rb
@@ -24,6 +24,10 @@ def delete_matched(matcher, options = nil)
         super
         @data.delete_if { |k,v| k =~ matcher }
       end
+      
+      def clear
+        @data.clear
+      end
     end
   end
 end
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