diff --git a/vncviewer/CConn.cxx b/vncviewer/CConn.cxx
index 262dd2c..140b1d6 100644
--- a/vncviewer/CConn.cxx
+++ b/vncviewer/CConn.cxx
@@ -439,7 +439,8 @@
 
   // RFB doesn't have separate selection and clipboard concepts, so we
   // dump the data into both variants.
-  Fl::copy(buffer, ret, 0);
+  if (setPrimary)
+    Fl::copy(buffer, ret, 0);
   Fl::copy(buffer, ret, 1);
 
   delete [] buffer;