diff --git a/htdocs/api/index.php b/htdocs/api/index.php
index 0e54d0cb8af..21d60bdab73 100644
--- a/htdocs/api/index.php
+++ b/htdocs/api/index.php
@@ -131,9 +131,9 @@ if (! empty($reg[1]) && $reg[1] == 'explorer' && ($reg[2] == '/resources.json' |
         {
             while (($file = readdir($handle))!==false)
             {
-                if (is_readable($dir.$file) && preg_match("/^mod(.*)\.class\.php$/i",$file,$reg))
+                if (is_readable($dir.$file) && preg_match("/^mod(.*)\.class\.php$/i",$file,$regmod))
                 {
-                    $module = strtolower($reg[1]);
+                    $module = strtolower($regmod[1]);
                     $moduledirforclass = getModuleDirForApiClass($module);
                     $moduleforperm = $module;
                     if ($module == 'propale') { $moduleforperm='propal'; }
@@ -159,9 +159,9 @@ if (! empty($reg[1]) && $reg[1] == 'explorer' && ($reg[2] == '/resources.json' |
                                 if ($file_searched == 'api_access.class.php') continue;
 
                                 // Support of the deprecated API.
-                                if (is_readable($dir_part.$file_searched) && preg_match("/^api_deprecated_(.*)\.class\.php$/i",$file_searched,$reg))
+                                if (is_readable($dir_part.$file_searched) && preg_match("/^api_deprecated_(.*)\.class\.php$/i",$file_searched,$regapi))
                                 {
-                                    $classname = ucwords($reg[1]).'Api';
+                                    $classname = ucwords($regapi[1]).'Api';
                                     require_once $dir_part.$file_searched;
                                     if (class_exists($classname))
                                     {
@@ -173,9 +173,9 @@ if (! empty($reg[1]) && $reg[1] == 'explorer' && ($reg[2] == '/resources.json' |
                                         dol_syslog("We found an api_xxx file (".$file_searched.") but class ".$classname." does not exists after loading file", LOG_WARNING);
                                     }
                                 }
-                                elseif (is_readable($dir_part.$file_searched) && preg_match("/^api_(.*)\.class\.php$/i",$file_searched,$reg))
+                                elseif (is_readable($dir_part.$file_searched) && preg_match("/^api_(.*)\.class\.php$/i",$file_searched,$regapi))
                                 {
-                                    $classname = ucwords($reg[1]);
+                                    $classname = ucwords($regapi[1]);
                                     $classname = str_replace('_', '', $classname);
                                     require_once $dir_part.$file_searched;
                                     if (class_exists($classname))