diff --git a/common/rfb/CMsgWriter.cxx b/common/rfb/CMsgWriter.cxx
index 82f7189..3f968de 100644
--- a/common/rfb/CMsgWriter.cxx
+++ b/common/rfb/CMsgWriter.cxx
@@ -64,6 +64,8 @@
     encodings[nEncodings++] = pseudoEncodingCursor;
   if (cp->supportsDesktopResize)
     encodings[nEncodings++] = pseudoEncodingDesktopSize;
+  if (cp->supportsExtendedDesktopSize)
+    encodings[nEncodings++] = pseudoEncodingExtendedDesktopSize;
   if (cp->supportsDesktopRename)
     encodings[nEncodings++] = pseudoEncodingDesktopName;
   if (Decoder::supported(preferredEncoding)) {