diff --git a/Makefile b/Makefile
index 8e60024ae..7d9d34472 100644
--- a/Makefile
+++ b/Makefile
@@ -89,7 +89,7 @@ sdist:
 	python setup.py sdist --format=gztar
 
 test:
-	python test-installed.py
+	pytest -qq
 
 # https://docs.python.org/2/distutils/packageindex.html#the-pypirc-file
 upload-test:
diff --git a/test-installed.py b/test-installed.py
deleted file mode 100755
index 35a3b4ccc..000000000
--- a/test-installed.py
+++ /dev/null
@@ -1,31 +0,0 @@
-#!/usr/bin/env python
-import os
-import sys
-
-import pytest
-
-# monkey with the path, removing the local directory but adding the Tests/
-# directory for helper.py and the other local imports there.
-
-del(sys.path[0])
-sys.path.insert(0, os.path.abspath('./Tests'))
-
-# if there's no test selected (mostly) choose a working default.
-# Something is required, because if we import the tests from the local
-# directory, once again, we've got the non-installed PIL in the way
-for i, arg in enumerate(sys.argv[1:]):
-    if arg.startswith('Tests/test_') and arg.endswith('.py'):
-        sys.argv.insert(i+1, '-k')
-        break
-else:
-    sys.argv.append('Tests')
-
-for arg in sys.argv:
-    if '-n' in arg or '--numprocesses' in arg:
-        break
-else:  # for
-    sys.argv.extend(['--numprocesses', 'auto'])  # auto-detect number of CPUs
-
-
-if __name__ == '__main__':
-    pytest.main()