diff --git a/src/java/davmail/exchange/DoubleDotInputStream.java b/src/java/davmail/exchange/DoubleDotInputStream.java
index 9c6287f8..d81d7be7 100644
--- a/src/java/davmail/exchange/DoubleDotInputStream.java
+++ b/src/java/davmail/exchange/DoubleDotInputStream.java
@@ -34,7 +34,7 @@ public class DoubleDotInputStream extends PushbackInputStream {
      * @inheritDoc
      */
     public DoubleDotInputStream(InputStream in) {
-        super(in, 3);
+        super(in, 4);
     }
 
     /**