diff --git a/lib/wash_out/param.rb b/lib/wash_out/param.rb
index 54dc3caf..1929eb70 100644
--- a/lib/wash_out/param.rb
+++ b/lib/wash_out/param.rb
@@ -61,13 +61,14 @@ def load(data, key)
         end
       else
         operation = case type
-          when 'string';    :to_s
-          when 'integer';   :to_i
-          when 'double';    :to_f
-          when 'boolean';   lambda{|dat| dat === "0" ? false : !!dat}
-          when 'date';      :to_date
-          when 'datetime';  :to_datetime
-          when 'time';      :to_time
+          when 'string';       :to_s
+          when 'integer';      :to_i
+          when 'double';       :to_f
+          when 'boolean';      lambda{|dat| dat === "0" ? false : !!dat}
+          when 'date';         :to_date
+          when 'datetime';     :to_datetime
+          when 'time';         :to_time
+          when 'base64Binary'; lambda{|dat| Base64.decode64(dat)}
           else raise RuntimeError, "Invalid WashOut simple type: #{type}"
         end
 
diff --git a/spec/lib/wash_out_spec.rb b/spec/lib/wash_out_spec.rb
index 01d74d23..af7d1e33 100644
--- a/spec/lib/wash_out_spec.rb
+++ b/spec/lib/wash_out_spec.rb
@@ -451,6 +451,19 @@ def date
         savon(:date, :value => '2000-12-30')
         lambda { savon(:date) }.should_not raise_exception
       end
+
+      it "recognize base64Binary" do
+        mock_controller do
+          soap_action "base64", :args => :base64Binary, :return => :nil
+          def base64
+            params[:value].should == 'test' unless params[:value].blank?
+            render :soap => nil
+          end
+        end
+
+        savon(:base64, :value => Base64.encode64('test'))
+        lambda { savon(:base64) }.should_not raise_exception
+      end
     end
 
     context "errors" do