diff --git a/core/src/main/java/org/jivesoftware/spark/ui/MessageEntry.java b/core/src/main/java/org/jivesoftware/spark/ui/MessageEntry.java
index 33bbfed03..f7274a631 100644
--- a/core/src/main/java/org/jivesoftware/spark/ui/MessageEntry.java
+++ b/core/src/main/java/org/jivesoftware/spark/ui/MessageEntry.java
@@ -382,7 +382,7 @@ public class MessageEntry extends TimeStampedEntry
                          .build()
             ) {
                 final ClassicHttpRequest request = ClassicRequestBuilder.get(url)
-                    .setHeader("Content-Type", "image/*")
+                    .setHeader("Accept", "image/*")
                     .setHeader("User-Agent", "Spark HttpFileUpload")
                     .build();