diff --git a/src/channel/PhutilChannelChannel.php b/src/channel/PhutilChannelChannel.php
--- a/src/channel/PhutilChannelChannel.php
+++ b/src/channel/PhutilChannelChannel.php
@@ -52,11 +52,11 @@
   }
 
   protected function readBytes($length) {
-    $this->throwOnRawByteOperations();
+    return $this->throwOnRawByteOperations();
   }
 
   protected function writeBytes($bytes) {
-    $this->throwOnRawByteOperations();
+    return $this->throwOnRawByteOperations();
   }
 
   protected function getReadSockets() {