diff --git a/src/main/scala/com/wordnik/swagger/codegen/util/ResourceExtractor.scala b/src/main/scala/com/wordnik/swagger/codegen/util/ResourceExtractor.scala
index 24551b99fcc..501b7af5910 100644
--- a/src/main/scala/com/wordnik/swagger/codegen/util/ResourceExtractor.scala
+++ b/src/main/scala/com/wordnik/swagger/codegen/util/ResourceExtractor.scala
@@ -19,7 +19,7 @@ package com.wordnik.swagger.codegen.util
 import scala.io.Source
 
 object ResourceExtractor {
-  def extractListing(path: String, apiKey: Option[String]) = {
+  def extractListing(path: String, apiKey: Option[String] = None) = {
 	path.startsWith("http") match {
 	  case true => Source.fromURL(path + apiKey.getOrElse("")).mkString
 	  case false => Source.fromFile(path).mkString