1 files changed, 5 insertions, 1 deletions
diff --git a/tox.ini b/tox.ini
index 01118451..97aa021f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -31,6 +31,9 @@ setenv =
     # For some tests, we need .pyc files written in the current directory,
     # so override any local setting.
     PYTHONPYCACHEPREFIX=
+    # Cog'ing the --help output depends on the width of the terminal,
+    # so set it explicitly to avoid environmental interference
+    COLUMNS=80
 
 commands =
     # Create tests/zipmods.zip
@@ -74,7 +77,8 @@ deps =
     -r requirements/lint.pip
 
 setenv =
-    LINTABLE = coverage tests doc ci igor.py setup.py __main__.py
+    {[testenv]setenv}
+    LINTABLE=coverage tests doc ci igor.py setup.py __main__.py
 
 commands =
     python -m tabnanny {env:LINTABLE}