lib/isomer/sources/base.rb in isomer-0.1.3 vs lib/isomer/sources/base.rb in isomer-0.1.4

@@ -25,10 +25,10 @@
 
     raise Isomer::RequiredParameterError, errors.join(', ') if !errors.empty?
   end
 
   def for(parameter)
-    configuration[parameter.name] || parameter.default
+    configuration.has_key?(parameter.name) ? configuration[parameter.name] : parameter.default
   end
 
   private
 
   def valid(value)
\ No newline at end of file