diff --git a/htdocs/categories/class/categorie.class.php b/htdocs/categories/class/categorie.class.php
index 7d3cdfde518..111f3bf8a88 100644
--- a/htdocs/categories/class/categorie.class.php
+++ b/htdocs/categories/class/categorie.class.php
@@ -2010,4 +2010,29 @@ class Categorie extends CommonObject
 			return "";
 		}
 	}
+	
+	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
+	/**
+	 *      Count all categories
+	 *
+	 *      @return int                             Number of categories, -1 on error
+	 */
+	public function count_all_categories()
+	{
+	dol_syslog(get_class($this)."::count_all_categories", LOG_DEBUG);
+			$sql = "SELECT COUNT(rowid) FROM ".MAIN_DB_PREFIX."categorie";
+			$sql .= " WHERE entity IN (".getEntity('category').")";
+
+			$res = $this->db->query($sql);
+			if ($res)
+			{
+		$obj = $this->db->fetch_object($res);
+					return $obj->count;
+			}
+			else
+			{
+					dol_print_error($this->db);
+					return -1;
+			}
+	}
 }