--- a/tests/run-tests.py	Mon Nov 23 22:46:48 2009 +0100
+++ b/tests/run-tests.py	Mon Nov 23 23:04:44 2009 +0100
@@ -793,6 +793,7 @@
     os.environ['TZ'] = 'GMT'
     os.environ["EMAIL"] = "Foo Bar <foo.bar@example.com>"
     os.environ['CDPATH'] = ''
+    os.environ['COLUMNS'] = '80'
 
     global TESTDIR, HGTMP, INST, BINDIR, PYTHONDIR, COVERAGE_FILE
     TESTDIR = os.environ["TESTDIR"] = os.getcwd()