diff --git a/tests/unit/phpunit.xml b/tests/unit/phpunit.xml
index 9c447bc..c1f9960 100644
--- a/tests/unit/phpunit.xml
+++ b/tests/unit/phpunit.xml
@@ -2,6 +2,7 @@
 <phpunit bootstrap="bootstrap.php"
 		 strict="true"
 		 verbose="true"
+		 convertDeprecationsToExceptions="true"
 		 timeoutForSmallTests="900"
 		 timeoutForMediumTests="900"
 		 timeoutForLargeTests="900"