diff --git a/console.php b/console.php
index cd40c01..30e5e2b 100644
--- a/console.php
+++ b/console.php
@@ -267,7 +267,6 @@ class console
     $minLength = mb_strlen ($this->lineContent) + 1;
     // Manage the history and a temporary buffer if the user has already type
     // something before calling the history
-    $historyTmp = "";
     $historyPos = count ($this->history);
     $string = $propo;
     echo $string;
@@ -488,7 +487,7 @@ class console
         // {{{
         {
           $this->debug ("Cursor up");
-          if ($string !== "" && $historyTmp == "")
+          if (! isset ($historyTmp))
           {
             $historyTmp = $string;
             $historyTmpPos = $cursorPos;
@@ -514,11 +513,11 @@ class console
             $string = $this->history[$historyPos];
             $cursorPos = mb_strlen ($prompt.$string) + 1;
           }
-          elseif ($historyTmp !== "")
+          elseif (isset ($historyTmp))
           {
             $string = $historyTmp;
             $cursorPos = $historyTmpPos;
-            $historyTmp = "";
+            unset ($historyTmp);
           }
           $this->rewriteLine ($prompt.$string);
           $this->moveCursor ($cursorPos);