diff --git a/lib/renderers/mute.js b/lib/renderers/mute.js
index c3bfeca5..df9a443b 100644
--- a/lib/renderers/mute.js
+++ b/lib/renderers/mute.js
@@ -4,6 +4,9 @@ function empty() {
 
 // -------------------------
 
+module.exports.head = empty;
+module.exports.tail = empty;
+
 module.exports.data = empty;
 module.exports.error = empty;
 module.exports.end = empty;
\ No newline at end of file