diff --git a/unix/x0vncserver/PollingManager.h b/unix/x0vncserver/PollingManager.h
index 9d62f0b..27bbf0f 100644
--- a/unix/x0vncserver/PollingManager.h
+++ b/unix/x0vncserver/PollingManager.h
@@ -99,7 +99,7 @@
 
   int checkRow(int x, int y, int w, bool *pChangeFlags);
   int checkColumn(int x, int y, int h, bool *pChangeFlags);
-  void sendChanges(const bool *pChangeFlags);
+  int sendChanges(const bool *pChangeFlags);
   void handleVideo(const bool *pChangeFlags);
   void flagVideoArea(bool *pChangeFlags, bool value);