diff --git a/lib/wsdl/xmlSchema/simpleType.rb b/lib/wsdl/xmlSchema/simpleType.rb
index a10420dd..6edd775a 100644
--- a/lib/wsdl/xmlSchema/simpleType.rb
+++ b/lib/wsdl/xmlSchema/simpleType.rb
@@ -76,9 +76,7 @@ def parse_attr(attr, value)
 private
 
   def check_restriction(value)
-    unless @restriction.valid?(value)
-      raise XSD::ValueSpaceError.new("#{@name}: cannot accept '#{value}'")
-    end
+    @restriction.valid?(value) || raise( XSD::ValueSpaceError.new("#{@name}: cannot accept '#{value}'") )
   end
 end