diff --git a/common/rfb/VNCServerST.cxx b/common/rfb/VNCServerST.cxx
index 43e8f3e..46c4be9 100644
--- a/common/rfb/VNCServerST.cxx
+++ b/common/rfb/VNCServerST.cxx
@@ -320,6 +320,7 @@
 
   comparer = new ComparingUpdateTracker(pb);
   renderedCursorInvalid = true;
+  startFrameClock();
 
   // Make sure that we have at least one screen
   if (screenLayout.num_screens() == 0)