diff --git a/tests/phpunit/Makefile b/tests/phpunit/Makefile
index be366553..eabe3a1b 100644
--- a/tests/phpunit/Makefile
+++ b/tests/phpunit/Makefile
@@ -1,2 +1,10 @@
+ifndef MW_INSTALL_PATH
+	MW_INSTALL_PATH=../../..
+endif
+
 default:
-	php ../../../tests/phpunit/phpunit.php .
+	php ${MW_INSTALL_PATH}/tests/phpunit/phpunit.php .
+
+.PHONY: *Test.php
+*Test.php:
+	php ${MW_INSTALL_PATH}/tests/phpunit/phpunit.php $@