diff --git a/common/rfb/HextileDecoder.h b/common/rfb/HextileDecoder.h
index 287b49d..67dc791 100644
--- a/common/rfb/HextileDecoder.h
+++ b/common/rfb/HextileDecoder.h
@@ -24,7 +24,7 @@
 
   class HextileDecoder : public Decoder {
   public:
-    HextileDecoder(CMsgReader* reader);
+    HextileDecoder(CConnection* conn);
     virtual ~HextileDecoder();
     virtual void readRect(const Rect& r, CMsgHandler* handler);
   };