diff --git a/win/winvnc/winvnc.cxx b/win/winvnc/winvnc.cxx
index 8fba9dc..b906865 100644
--- a/win/winvnc/winvnc.cxx
+++ b/win/winvnc/winvnc.cxx
@@ -87,7 +87,7 @@
   } else {
     if (isError) {
       try {
-        vlog.error(msg);
+        vlog.error("%s", msg);
         return;
       } catch (...) {
       }