diff --git a/src/Composer/EventDispatcher/EventDispatcher.php b/src/Composer/EventDispatcher/EventDispatcher.php
index 396f21731..e6cc378a0 100644
--- a/src/Composer/EventDispatcher/EventDispatcher.php
+++ b/src/Composer/EventDispatcher/EventDispatcher.php
@@ -469,7 +469,7 @@ class EventDispatcher
      */
     protected function isComposerScript($callable)
     {
-        return '@composer ' === substr($callable, 0, 10);
+        return '@' === substr($callable, 0, 1) && '@php ' !== substr($callable, 0, 5);
     }
 
     /**
diff --git a/tests/Composer/Test/Repository/Vcs/PerforceDriverTest.php b/tests/Composer/Test/Repository/Vcs/PerforceDriverTest.php
index 987751408..05adbf030 100644
--- a/tests/Composer/Test/Repository/Vcs/PerforceDriverTest.php
+++ b/tests/Composer/Test/Repository/Vcs/PerforceDriverTest.php
@@ -122,8 +122,8 @@ class PerforceDriverTest extends TestCase
 
     public function testInitializeLogsInAndConnectsClient()
     {
-        $this->perforce->expects($this->at(0))->method('p4Login')->with($this->identicalTo($this->io));
-        $this->perforce->expects($this->at(1))->method('checkStream')->with($this->equalTo(self::TEST_DEPOT));
+        $this->perforce->expects($this->at(0))->method('p4Login');
+        $this->perforce->expects($this->at(1))->method('checkStream');
         $this->perforce->expects($this->at(2))->method('writeP4ClientSpec');
         $this->perforce->expects($this->at(3))->method('connectClient');
         $this->driver->initialize();