gistfile1.txt

diff --git a/mojo/public/tools/bindings/generators/java_templates/interface_definition.tmpl b/mojo/public/tools/bindings/generators/java_templates/interface_definition.tmpl
index 39c17cc..03e5408 100644
--- a/mojo/public/tools/bindings/generators/java_templates/interface_definition.tmpl
+++ b/mojo/public/tools/bindings/generators/java_templates/interface_definition.tmpl
@@ -40,8 +40,8 @@ interface {{method|interface_response_name}} extends org.chromium.mojo.bindings.
 {{flags(method.response_parameters, is_parameter)}}
 {%- endmacro -%}
 
-{%- macro flags(has_response_parameters, is_parameter) -%}
-{%-  if not has_response_parameters -%}
+{%- macro flags(response_parameters, is_parameter) -%}
+{%-  if response_parameters is None -%}
 org.chromium.mojo.bindings.MessageHeader.NO_FLAG
 {%-   elif is_parameter: -%}
 org.chromium.mojo.bindings.MessageHeader.MESSAGE_EXPECTS_RESPONSE_FLAG