diff --git a/common/rfb/CMsgHandler.cxx b/common/rfb/CMsgHandler.cxx
index 65e96f3..de99abd 100644
--- a/common/rfb/CMsgHandler.cxx
+++ b/common/rfb/CMsgHandler.cxx
@@ -44,7 +44,7 @@
 {
   cp.supportsSetDesktopSize = true;
 
-  if ((reason == reasonClient) && (result != resultSuccess))
+  if ((reason == (signed)reasonClient) && (result != (signed)resultSuccess))
     return;
 
   if (!layout.validate(width, height))