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@@ -97,9 +97,7 @@ module DataMapper
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     def validation_property_value(name)
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-      return self.instance_variable_get("@#{name}") if self.instance_variables.include?(name)
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-      return self.send(name) if self.respond_to?(name)
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-      nil
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+      self.respond_to?(name, true) ? self.send(name) : nil
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     end
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     # Get the corresponding Resource property, if it exists.

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@@ -336,4 +336,17 @@ describe DataMapper::Validate do
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     invoice.all_valid?.should == true
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   end
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+
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+  it "should retrieve private instance variables for validation" do
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+    class Raft
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+      include DataMapper::Resource
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+      property :length, Integer, :accessor => :private
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+
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+      def initialize(length)
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+        @length = length
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+      end
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+    end
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+
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+    Raft.new(10).validation_property_value("length").should == 10
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+  end
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 end