diff --git a/ecrire/bootstrap/config/initial.php b/ecrire/bootstrap/config/initial.php
index 7dbc1fb7b004adb5974a8d5941e94eb74941c34f..2d95c29e9f653931623d5777bef46f4c86cd3bcd 100644
--- a/ecrire/bootstrap/config/initial.php
+++ b/ecrire/bootstrap/config/initial.php
@@ -26,9 +26,9 @@ define('_DIR_RESTREINT', (is_dir(_DIR_RESTREINT_ABS) ? _DIR_RESTREINT_ABS : ''))
 define('_DIR_RACINE', _DIR_RESTREINT ? '' : '../');
 
 /** chemin absolu vers la racine */
-define('_ROOT_RACINE', dirname(__DIR__, 3) . '/');
+define('_ROOT_RACINE', dirname(__DIR__, 3) . DIRECTORY_SEPARATOR);
 /** chemin absolu vers le repertoire de travail */
-define('_ROOT_CWD', getcwd() . '/');
+define('_ROOT_CWD', getcwd() . DIRECTORY_SEPARATOR);
 /** chemin absolu vers ecrire */
 define('_ROOT_RESTREINT', _ROOT_CWD . _DIR_RESTREINT);
 
@@ -61,7 +61,7 @@ if (!defined('_NOM_IMG_PACK')) {
 define('_DIR_IMG_PACK', (_DIR_RACINE . 'prive/' . _NOM_IMG_PACK));
 
 /** le chemin php (absolu) vers les images standard (pour hebergement centralise) */
-define('_ROOT_IMG_PACK', dirname(__DIR__, 3) . '/prive/' . _NOM_IMG_PACK);
+define('_ROOT_IMG_PACK', dirname(__DIR__, 3) . DIRECTORY_SEPARATOR . 'prive' . DIRECTORY_SEPARATOR . _NOM_IMG_PACK);
 
 if (!defined('_JAVASCRIPT')) {
 	/** Nom du repertoire des  bibliotheques JavaScript */
diff --git a/ecrire/bootstrap/inc/initialization.php b/ecrire/bootstrap/inc/initialization.php
index 9d446e33635039427b0c5f8af5d9cbe7fd946396..f70332a689ecc16265b2fe9e1cf4c81e1e6c164f 100644
--- a/ecrire/bootstrap/inc/initialization.php
+++ b/ecrire/bootstrap/inc/initialization.php
@@ -195,10 +195,10 @@ function spip_initialisation_core($pi = null, $pa = null, $ti = null, $ta = null
 		define('_DEFAULT_CHARSET', 'utf-8');
 	}
 	if (!defined('_ROOT_PLUGINS')) {
-		define('_ROOT_PLUGINS', _ROOT_RACINE . 'plugins/');
+		define('_ROOT_PLUGINS', _ROOT_RACINE . 'plugins' . DIRECTORY_SEPARATOR);
 	}
 	if (!defined('_ROOT_PLUGINS_DIST')) {
-		define('_ROOT_PLUGINS_DIST', _ROOT_RACINE . 'plugins-dist/');
+		define('_ROOT_PLUGINS_DIST', _ROOT_RACINE . 'plugins-dist' . DIRECTORY_SEPARATOR);
 	}
 	if (!defined('_ROOT_PLUGINS_SUPPL') && defined('_DIR_PLUGINS_SUPPL') && _DIR_PLUGINS_SUPPL) {
 		define('_ROOT_PLUGINS_SUPPL', _ROOT_RACINE . str_replace(_DIR_RACINE, '', _DIR_PLUGINS_SUPPL));