diff --git a/bin/tools/safe_eval.py b/bin/tools/safe_eval.py
index 67d2a98e973..fa6e04bf92c 100644
--- a/bin/tools/safe_eval.py
+++ b/bin/tools/safe_eval.py
@@ -264,6 +264,7 @@ def safe_eval(expr, globals_dict=None, locals_dict=None, mode="eval", nocopy=Fal
                 'reduce': reduce,
                 'filter': filter,
                 'round': round,
+                'len': len
             }
     )
     return eval(test_expr(expr,_SAFE_OPCODES, mode=mode), globals_dict, locals_dict)