diff --git a/src/phpDocumentor/Reflection/DocBlock/Tag/ParamTag.php b/src/phpDocumentor/Reflection/DocBlock/Tag/ParamTag.php
index 8214534..dc61e8b 100644
--- a/src/phpDocumentor/Reflection/DocBlock/Tag/ParamTag.php
+++ b/src/phpDocumentor/Reflection/DocBlock/Tag/ParamTag.php
@@ -69,7 +69,7 @@ class ParamTag extends Tag
                 : trim($type);
         }
 
-        return $types;
+        return array_values(array_unique($types, SORT_REGULAR));
     }
 
     /**