diff --git a/src/Transport/File.php b/src/Transport/File.php
index 3b4b9783..ec18bb06 100644
--- a/src/Transport/File.php
+++ b/src/Transport/File.php
@@ -70,7 +70,7 @@ public function setOptions(FileOptions $options)
     public function send(Message $message)
     {
         $options  = $this->options;
-        $filename = call_user_func($options->getCallback(), $this);
+        $filename = $options->getCallback()($this);
         $file     = $options->getPath() . DIRECTORY_SEPARATOR . $filename;
         $email    = $message->toString();
 
diff --git a/src/Transport/Sendmail.php b/src/Transport/Sendmail.php
index 3223b3fa..15b64065 100644
--- a/src/Transport/Sendmail.php
+++ b/src/Transport/Sendmail.php
@@ -133,7 +133,7 @@ public function send(Mail\Message $message)
             $headers = str_replace("\r\n", "\n", $headers);
         }
 
-        call_user_func($this->callable, $to, $subject, $body, $headers, $params);
+        ($this->callable)($to, $subject, $body, $headers, $params);
     }
 
     /**
diff --git a/test/Header/AddressListHeaderTest.php b/test/Header/AddressListHeaderTest.php
index 621422d3..2822bc25 100644
--- a/test/Header/AddressListHeaderTest.php
+++ b/test/Header/AddressListHeaderTest.php
@@ -118,7 +118,7 @@ public function getStringHeaders()
     public function testDeserializationFromString($headerLine, $class)
     {
         $callback = sprintf('%s::fromString', $class);
-        $header   = call_user_func($callback, $headerLine);
+        $header   = $callback($headerLine);
         $this->assertInstanceOf($class, $header);
         $list = $header->getAddressList();
         $this->assertEquals(4, count($list));
@@ -175,7 +175,7 @@ public function getHeadersWithComments()
     public function testAllowsNoWhitespaceBetweenHeaderAndValue($headerLine, $class)
     {
         $callback = sprintf('%s::fromString', $class);
-        $header   = call_user_func($callback, $headerLine);
+        $header   = $callback($headerLine);
         $this->assertInstanceOf($class, $header);
         $list = $header->getAddressList();
         $this->assertEquals(4, count($list));
diff --git a/test/Transport/FileOptionsTest.php b/test/Transport/FileOptionsTest.php
index e037deaf..b7ecff33 100644
--- a/test/Transport/FileOptionsTest.php
+++ b/test/Transport/FileOptionsTest.php
@@ -35,7 +35,7 @@ public function testDefaultCallbackIsSetByDefault()
     {
         $callback = $this->options->getCallback();
         $this->assertInternalType('callable', $callback);
-        $test     = call_user_func($callback, '');
+        $test     = $callback('');
         $this->assertRegExp('#^LaminasMail_\d+_\d+\.eml$#', $test);
     }