diff --git a/libraries/loader.php b/libraries/loader.php
index 5883847634300..f33504365a9df 100644
--- a/libraries/loader.php
+++ b/libraries/loader.php
@@ -567,17 +567,21 @@ class_alias(self::$classAliases[$class], $class);
      *
      * @since   3.4
      */
+    
     public static function applyAliasFor($class)
     {
         $class = self::stripFirstBackslash($class);
 
         if (isset(self::$classAliasesInverse[$class])) {
             foreach (self::$classAliasesInverse[$class] as $alias) {
-                class_alias($class, $alias);
+                if (!class_exists($alias, false) && !interface_exists($alias, false) && !trait_exists($alias, false)) {
+                    class_alias($class, $alias);
+                }
             }
         }
     }
 
+
     /**
      * Autoload a class based on name.
      *