diff --git a/tiramisu/option.py b/tiramisu/option.py
index 1c14efc..361919c 100644
--- a/tiramisu/option.py
+++ b/tiramisu/option.py
@@ -843,3 +843,4 @@ def validate_requires_arg(requires, name):
                                      " action: {1}").format(name, action))
             else:
                 config_action[action] = inverse
+    return requires