diff --git a/src/java/com/kerosenelabs/kindling/HttpResponse.java b/src/java/com/kerosenelabs/kindling/HttpResponse.java
index 64676bc..406623d 100644
--- a/src/java/com/kerosenelabs/kindling/HttpResponse.java
+++ b/src/java/com/kerosenelabs/kindling/HttpResponse.java
@@ -33,6 +33,7 @@ public class HttpResponse {
         if (contentType == null) {
             throw new KindlingException("Programming error, you must specify a Content");
         }
+        headers.put("Content-Type", contentType.getMimeType());
     }
 
     public String toString() {