diff --git a/common/rfb/PixelFormat.cxx b/common/rfb/PixelFormat.cxx
index b00bc82..a106cf3 100644
--- a/common/rfb/PixelFormat.cxx
+++ b/common/rfb/PixelFormat.cxx
@@ -386,6 +386,9 @@
   } else {
     return false;
   }
+
+  updateShifts();
+
   return true;
 }