diff --git a/src/main/java/nl/goodbytes/xmpp/xep0363/SlotManager.java b/src/main/java/nl/goodbytes/xmpp/xep0363/SlotManager.java
index b77f7fb..57fc3d4 100644
--- a/src/main/java/nl/goodbytes/xmpp/xep0363/SlotManager.java
+++ b/src/main/java/nl/goodbytes/xmpp/xep0363/SlotManager.java
@@ -33,9 +33,10 @@
 // TODO: persist internal state to allow for restart survival.
 public class SlotManager
 {
+    public static final long DEFAULT_MAX_FILE_SIZE = 5 * 1024 * 1024;
     private static SlotManager INSTANCE = null;
     private final Cache<UUID, Slot> slots;
-    private long maxFileSize = 5 * 1024 * 1024;
+    private long maxFileSize = DEFAULT_MAX_FILE_SIZE;
     private long putExpiryValue = 5;
     private TimeUnit putExpiryUnit = TimeUnit.MINUTES;