diff --git a/plugin/visualmark.vim b/plugin/visualmark.vim
index 964895c..fe5b903 100644
--- a/plugin/visualmark.vim
+++ b/plugin/visualmark.vim
@@ -27,7 +27,6 @@ endif
 "  Public Interface:
 if !hasmapto('<Plug>Vm_toggle_sign')
   map <unique> <c-F2> <Plug>Vm_toggle_sign
-  map <silent> <unique> mm <Plug>Vm_toggle_sign 
 endif
 nnoremap <silent> <script> <Plug>Vm_toggle_sign	:call Vm_toggle_sign()<cr>