diff --git a/tests/run-tests.py b/tests/run-tests.py
--- a/tests/run-tests.py
+++ b/tests/run-tests.py
@@ -2948,7 +2948,7 @@
         self._hgtmp = None
         self._installdir = None
         self._bindir = None
-        self._tmpbinddir = None
+        self._tmpbindir = None
         self._pythondir = None
         self._coveragefile = None
         self._createdfiles = []