diff --git a/common/rfb/CConnection.cxx b/common/rfb/CConnection.cxx
index e0a23b5..8ccd948 100644
--- a/common/rfb/CConnection.cxx
+++ b/common/rfb/CConnection.cxx
@@ -97,12 +97,11 @@
 
   // The only official RFB protocol versions are currently 3.3, 3.7 and 3.8
   if (cp.beforeVersion(3,3)) {
-    char msg[256];
-    sprintf(msg,"Server gave unsupported RFB protocol version %d.%d",
-            cp.majorVersion, cp.minorVersion);
-    vlog.error("%s", msg);
+    vlog.error("Server gave unsupported RFB protocol version %d.%d",
+               cp.majorVersion, cp.minorVersion);
     state_ = RFBSTATE_INVALID;
-    throw Exception(msg);
+    throw Exception("Server gave unsupported RFB protocol version %d.%d",
+                    cp.majorVersion, cp.minorVersion);
   } else if (useProtocol3_3 || cp.beforeVersion(3,7)) {
     cp.setVersion(3,3);
   } else if (cp.afterVersion(3,8)) {