diff --git a/builtin/whitespace.ne b/builtin/whitespace.ne
index 00dc315c..9a6ca1c6 100644
--- a/builtin/whitespace.ne
+++ b/builtin/whitespace.ne
@@ -1,5 +1,5 @@
 # Whitespace: `_` is optional, `__` is mandatory.
-_  -> wschar:* {% function(d) {return null;} %}
-__ -> wschar:+ {% function(d) {return null;} %}
+_  -> wschar:* {% function() {return null;} %}
+__ -> wschar:+ {% function() {return null;} %}
 
 wschar -> [ \t\n\v\f] {% id %}