diff --git a/htdocs/product/class/product.class.php b/htdocs/product/class/product.class.php
index 30e1d48cd18..b4070653530 100644
--- a/htdocs/product/class/product.class.php
+++ b/htdocs/product/class/product.class.php
@@ -139,10 +139,10 @@ class Product extends CommonObject
      */
     public $price_min_ttc;
 
-    /*
-    * Base price ('TTC' for price including tax or 'HT' for net price)
-    * @var float
-    */
+    /**
+     * Base price ('TTC' for price including tax or 'HT' for net price)
+     * @var string
+     */
     public $price_base_type;
 
     //! Arrays for multiprices