diff --git a/common/rfb/HextileEncoder.h b/common/rfb/HextileEncoder.h
index c78107a..6b89643 100644
--- a/common/rfb/HextileEncoder.h
+++ b/common/rfb/HextileEncoder.h
@@ -25,7 +25,7 @@
   class HextileEncoder : public Encoder {
   public:
     static Encoder* create(SMsgWriter* writer);
-    virtual bool writeRect(const Rect& r, ImageGetter* ig, Rect* actual);
+    virtual bool writeRect(const Rect& r, TransImageGetter* ig, Rect* actual);
     virtual ~HextileEncoder();
   private:
     HextileEncoder(SMsgWriter* writer);