diff --git a/plugins/sudo/sudo.plugin.sh b/plugins/sudo/sudo.plugin.sh
index 43835e3..5751202 100644
--- a/plugins/sudo/sudo.plugin.sh
+++ b/plugins/sudo/sudo.plugin.sh
@@ -1,11 +1,23 @@
 #! bash oh-my-bash.module
 
+function _omb_plugin_sudo__is_inserted {
+  [[ "$READLINE_LINE" = 'sudo '* ]]
+}
+
 function _omb_plugin_sudo_add_sudo {
   if [[ -z $READLINE_LINE ]]; then
     READLINE_LINE="$(fc -ln -1 | command sed 's/^[[:space:]]\{1,\}//')"
+    READLINE_POINT=${#READLINE_LINE}
+    _omb_plugin_sudo__is_inserted && return
   fi
-  READLINE_LINE="sudo $READLINE_LINE"
-  ((READLINE_POINT += 5))
+  if _omb_plugin_sudo__is_inserted; then
+    READLINE_LINE="${READLINE_LINE#sudo }"
+    ((READLINE_POINT -= 5))
+  else
+    READLINE_LINE="sudo $READLINE_LINE"
+    ((READLINE_POINT += 5))
+  fi
+  ((READLINE_POINT < 0)) && READLINE_POINT=0
 }
 
 bind -m emacs -x '"\e\e": _omb_plugin_sudo_add_sudo'