diff --git a/source_commit b/source_commit
index 8daf7c4b..a991579c 100644
--- a/source_commit
+++ b/source_commit
@@ -1 +1 @@
-4c29320e4ed7ed042cff9d5111ec7b1555c274aa
+e322cd8729d7f862a313ce1ef74681bb4fc7412b
diff --git a/uws.js b/uws.js
index 0eccec16..e6a57707 100644
--- a/uws.js
+++ b/uws.js
@@ -32,7 +32,7 @@ module.exports.DeclarativeResponse = class DeclarativeResponse {
   _appendInstruction(opcode, ...text) {
     this.instructions.push(opcode);
     text.forEach(str => {
-      const bytes = (typeof data === 'string') ? new TextEncoder().encode(str) : str;
+      const bytes = (typeof str === 'string') ? new TextEncoder().encode(str) : str;
       this.instructions.push(bytes.length, ...bytes);
     });
   }