diff --git a/src/com/fsck/k9/activity/MessageCompose.java b/src/com/fsck/k9/activity/MessageCompose.java
index 57ba0a087..f1676615e 100644
--- a/src/com/fsck/k9/activity/MessageCompose.java
+++ b/src/com/fsck/k9/activity/MessageCompose.java
@@ -237,7 +237,7 @@ public class MessageCompose extends K9Activity implements OnClickListener, OnFoc
     private Validator mAddressValidator;
 
 
-    class Attachment implements Serializable
+    static class Attachment implements Serializable
     {
         public String name;
         public String contentType;