diff --git a/src/com/fsck/k9/mail/filter/CountingOutputStream.java b/src/com/fsck/k9/mail/filter/CountingOutputStream.java
index 19a5d7661..05960243d 100644
--- a/src/com/fsck/k9/mail/filter/CountingOutputStream.java
+++ b/src/com/fsck/k9/mail/filter/CountingOutputStream.java
@@ -21,4 +21,10 @@ public class CountingOutputStream extends OutputStream {
     public void write(int oneByte) throws IOException {
         mCount++;
     }
+    public void write(byte b[], int offset, int len) throws IOException {
+        mCount += len;
+    }
+    public void write(byte[] b) throws IOException {
+        mCount += b.length;
+    }
 }