diff -U3 -r jsonschema-2.6.0-orig/jsonschema/tests/test_jsonschema_test_suite.py jsonschema-2.6.0/jsonschema/tests/test_jsonschema_test_suite.py
--- jsonschema-2.6.0-orig/jsonschema/tests/test_jsonschema_test_suite.py	2016-11-27 16:49:17.000000000 +0100
+++ jsonschema-2.6.0/jsonschema/tests/test_jsonschema_test_suite.py	2018-05-30 15:29:44.840669853 +0200
@@ -47,7 +47,7 @@
 JSONSCHEMA_SUITE = os.path.join(SUITE, "bin", "jsonschema_suite")
 
 remotes_stdout = subprocess.Popen(
-    ["python", JSONSCHEMA_SUITE, "remotes"], stdout=subprocess.PIPE,
+    [sys.executable, JSONSCHEMA_SUITE, "remotes"], stdout=subprocess.PIPE,
 ).stdout
 
 with closing(remotes_stdout):