diff --git a/Unit_testing/SimpleTestListener.php b/Unit_testing/SimpleTestListener.php
index 086a37d..63af387 100644
--- a/Unit_testing/SimpleTestListener.php
+++ b/Unit_testing/SimpleTestListener.php
@@ -156,10 +156,10 @@
 	}
 	
 	abstract public function printPass();
-	abstract public function printFailure( PHPUnit_Framework_AssertionFailedError $e );
-	abstract public function printError( PHPUnit_Framework_AssertionFailedError $e );
-	abstract public function printIncomplete( PHPUnit_Framework_AssertionFailedError $e );
-	abstract public function printSkip( PHPUnit_Framework_AssertionFailedError $e );
+	abstract public function printFailure( Exception $e );
+	abstract public function printError( Exception $e );
+	abstract public function printIncomplete( Exception $e );
+	abstract public function printSkip( Exception $e );
 }
 
 ?>