diff --git a/tests/run-tests.py b/tests/run-tests.py
index d882a8786ddf92489d84ecdede6870897b01a490_dGVzdHMvcnVuLXRlc3RzLnB5..1ce16c7b7fb4e0f92aca8f882767feaa464848bb_dGVzdHMvcnVuLXRlc3RzLnB5 100755
--- a/tests/run-tests.py
+++ b/tests/run-tests.py
@@ -101,6 +101,8 @@
 if 'java' in sys.platform:
     IMPL_PATH = 'JYTHONPATH'
 
+TESTDIR = HGTMP = INST = BINDIR = TMPBINDIR = PYTHONDIR = None
+
 requiredtools = [os.path.basename(sys.executable), "diff", "grep", "unzip",
                  "gunzip", "bunzip2", "sed"]
 createdfiles = []