diff --git a/flask_restplus/reqparse.py b/flask_restplus/reqparse.py
index d24b4d38..17bdcff6 100644
--- a/flask_restplus/reqparse.py
+++ b/flask_restplus/reqparse.py
@@ -232,7 +232,7 @@ def parse(self, request, bundle_errors=False):
                             continue
                         return self.handle_validation_error(error, bundle_errors)
 
-                    if self.choices and value not in self.choices:
+                    if self.nullable is False and self.choices and value not in self.choices:
                         msg = 'The value \'{0}\' is not a valid choice for \'{1}\'.'.format(value, name)
                         return self.handle_validation_error(msg, bundle_errors)