diff --git a/cli.php b/cli.php
index 529adb4..5de5316 100644
--- a/cli.php
+++ b/cli.php
@@ -82,7 +82,8 @@ class cli
       $class = $argv[1];
       if (!in_array ($class, $classes))
         die ("Unknown class '$class'\n");
-      $file = reset (array_keys ($classes, $class));
+      $classesNames = array_keys ($classes, $class);
+      $file = reset ($classesNames);
       require_once ($file);
       $refclass = new ReflectionClass ($class);
       // Look at constructor parameters
@@ -148,7 +149,8 @@ class cli
     if (!in_array ($class, $classes))
       die ("Unknown class '$class'\n");
     array_shift ($argv);
-    $file = reset (array_keys ($classes, $class));
+    $classesNames = array_keys ($classes, $class);
+    $file = reset ($classesNames);
     require_once ($file);
     if (!isset ($argv[0]))
       die ("No method for class '$class' to execute\n");