diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index be046ae889dd2..89933fcd49974 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -622,7 +622,7 @@ function dol_include_once($relpath, $classname = '')
 	$fullpath = dol_buildpath($relpath);
 
 	if (!file_exists($fullpath)) {
-		dol_syslog('functions::dol_include_once Tried to load unexisting file: '.$relpath, LOG_ERR);
+		dol_syslog('functions::dol_include_once Tried to load unexisting file: '.$relpath, LOG_WARNING);
 		return false;
 	}