diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 78326ee3bb7..eb2cc15de15 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -236,11 +236,15 @@ function dol_getprefix()
  *
  * 	@param	string	$relpath	Relative path to file (Ie: mydir/myfile, ../myfile, ...)
  * 	@param	string	$classname	Class name
- *  @return int					false if include fails.
+ *  @return bool
  */
 function dol_include_once($relpath, $classname='')
 {
-	global $conf,$langs,$user,$mysoc;   // Other global var must be retreived with $GLOBALS['var']
+
+	if (!file_exists($relpath)) {
+		dol_syslog('functions::dol_include_once Tried to load unexisting file: '.$relpath, LOG_ERR);
+		return false;
+	}
 
 	if (! empty($classname) && ! class_exists($classname)) {
 		return include dol_buildpath($relpath);