diff --git a/modules/swagger-codegen/src/main/java/com/wordnik/swagger/codegen/CodegenResponse.java b/modules/swagger-codegen/src/main/java/com/wordnik/swagger/codegen/CodegenResponse.java
index f90e38833bd2..15931c9fd271 100644
--- a/modules/swagger-codegen/src/main/java/com/wordnik/swagger/codegen/CodegenResponse.java
+++ b/modules/swagger-codegen/src/main/java/com/wordnik/swagger/codegen/CodegenResponse.java
@@ -6,7 +6,7 @@ public class CodegenResponse {
   public String code, message;
   public Boolean hasMore;
   public List<Map<String, String>> examples;
-  public List<CodegenProperty> headers;
+  public final List<CodegenProperty> headers = new ArrayList<CodegenProperty>();
   public String dataType, baseType, containerType;
   public Boolean simpleType;
   public Boolean primitiveType;