--- a/tests/run-tests.py	Mon Oct 15 23:28:45 2012 +0200
+++ b/tests/run-tests.py	Tue Mar 12 10:37:48 2013 -0700
@@ -1277,6 +1277,9 @@
         # can't remove on solaris
         os.environ['HG'] = ''
         del os.environ['HG']
+    if 'HGPROF' in os.environ:
+        os.environ['HGPROF'] = ''
+        del os.environ['HGPROF']
 
     global TESTDIR, HGTMP, INST, BINDIR, PYTHONDIR, COVERAGE_FILE
     TESTDIR = os.environ["TESTDIR"] = os.getcwd()