diff --git a/lib/Forking/Fork.php b/lib/Forking/Fork.php
index ce643e8..9c01551 100644
--- a/lib/Forking/Fork.php
+++ b/lib/Forking/Fork.php
@@ -205,7 +205,7 @@ class Fork implements Process, Strand {
     private function execute(Channel $channel): \Generator {
         try {
             if ($this->function instanceof \Closure) {
-                $result = call($this->function->bindTo($channel, Channel::class), ...$this->args);
+                $result = call($this->function->bindTo($channel, null), ...$this->args);
             } else {
                 $result = call($this->function, ...$this->args);
             }
diff --git a/lib/Threading/Internal/Thread.php b/lib/Threading/Internal/Thread.php
index af9a79e..b6ba833 100644
--- a/lib/Threading/Internal/Thread.php
+++ b/lib/Threading/Internal/Thread.php
@@ -121,7 +121,7 @@ class Thread extends \Thread {
     private function execute(Channel $channel): \Generator {
         try {
             if ($this->function instanceof \Closure) {
-                $result = call($this->function->bindTo($channel, Channel::class), ...$this->args);
+                $result = call($this->function->bindTo($channel, null), ...$this->args);
             } else {
                 $result = call($this->function, ...$this->args);
             }