diff --git a/phpseclib/Net/SCP.php b/phpseclib/Net/SCP.php
index 4cfa3570..f66a535a 100644
--- a/phpseclib/Net/SCP.php
+++ b/phpseclib/Net/SCP.php
@@ -216,7 +216,7 @@ class Net_SCP
             $sent+= strlen($temp);
 
             if (is_callable($callback)) {
-                $callback($sent);
+                call_user_func($callback, $sent);
             }
         }
         $this->_close();
diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 2fddb68a..d3bc7c60 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -2258,7 +2258,7 @@ class Net_SSH2
                     return false;
                 default:
                     if (is_callable($callback)) {
-                        $callback($temp);
+                        call_user_func($callback, $temp);
                     } else {
                         $output.= $temp;
                     }
diff --git a/tests/Net/SSH2FunctionalTest.php b/tests/Net/SSH2FunctionalTest.php
index 34a9377b..3078bd40 100644
--- a/tests/Net/SSH2FunctionalTest.php
+++ b/tests/Net/SSH2FunctionalTest.php
@@ -41,5 +41,21 @@ class Net_SSH2FunctionalTest extends PhpseclibFunctionalTestCase
             $ssh->login($username, $password),
             'SSH2 login using password failed.'
         );
+
+        return $ssh;
+    }
+
+    /**
+    * @depends testPasswordLogin
+    * @group bug280
+    */
+    public function testExecWithMethodCallback($ssh)
+    {
+        $callbackObject = $this->getMock('stdClass', array('callbackMethod'));
+        $callbackObject
+            ->expects($this->atLeastOnce())
+            ->method('callbackMethod')
+            ->will($this->returnValue(true));
+        $ssh->exec('ls', array($callbackObject, 'callbackMethod'));
     }
 }