diff --git a/win/vncviewer/CConn.h b/win/vncviewer/CConn.h
index 29023f3..d294f9e 100644
--- a/win/vncviewer/CConn.h
+++ b/win/vncviewer/CConn.h
@@ -105,7 +105,7 @@
       void setCursor(int w, int h, const Point& hotspot, void* data, void* mask);
       void setName(const char* name);
       void serverInit();
-      void serverCutText(const char* str, int len);
+      void serverCutText(const char* str, rdr::U32 len);
       void beginRect(const Rect& r, unsigned int encoding);
       void endRect(const Rect& r, unsigned int encoding);
       void fillRect(const Rect& r, Pixel pix);