diff --git a/vncviewer/CConn.cxx b/vncviewer/CConn.cxx
index 97e35ba..4aeb03f 100644
--- a/vncviewer/CConn.cxx
+++ b/vncviewer/CConn.cxx
@@ -350,6 +350,9 @@
   char *buffer;
   int size, ret;
 
+  if (!acceptClipboard)
+    return;
+
   size = fl_utf8froma(NULL, 0, str, len);
   if (size <= 0)
     return;