diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 6fe032f5456..0298ce0d439 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -9738,6 +9738,7 @@ function dol_eval($s, $returnvalue = 0, $hideerrors = 1, $onlysimplestring = '1'
 		$forbiddenphpfunctions = array_merge($forbiddenphpfunctions, array("fopen", "file_put_contents", "fputs", "fputscsv", "fwrite", "fpassthru", "require", "include", "mkdir", "rmdir", "symlink", "touch", "unlink", "umask"));
 		$forbiddenphpfunctions = array_merge($forbiddenphpfunctions, array("get_defined_functions", "get_defined_vars", "get_defined_constants", "get_declared_classes"));
 		$forbiddenphpfunctions = array_merge($forbiddenphpfunctions, array("function", "call_user_func"));
+		$forbiddenphpfunctions = array_merge($forbiddenphpfunctions, array("require", "include", "require_once", "include_once"));
 		$forbiddenphpfunctions = array_merge($forbiddenphpfunctions, array("eval", "create_function", "assert", "mb_ereg_replace")); // function with eval capabilities
 
 		$forbiddenphpmethods = array('invoke', 'invokeArgs');	// Method of ReflectionFunction to execute a function