diff --git a/src/httpd.js.c b/src/httpd.js.c
index 85792a63..2c44c2d2 100644
--- a/src/httpd.js.c
+++ b/src/httpd.js.c
@@ -39,7 +39,7 @@ static JSValue _httpd_response_end(JSContext* context, JSValueConst this_val, in
 	tf_http_request_t* request = JS_GetOpaque(this_val, _httpd_request_class_id);
 	size_t length = 0;
 	const void* data = NULL;
-	JSValue buffer;
+	JSValue buffer = JS_UNDEFINED;
 	if (JS_IsString(argv[0]))
 	{
 		data = JS_ToCStringLen(context, &length, argv[0]);