--- a/hgext/patchbomb.py
+++ b/hgext/patchbomb.py
@@ -383,7 +383,7 @@ def patchbomb(ui, repo, *revs, **opts):
ui.status('Displaying ', m['Subject'], ' ...\n')
ui.flush()
if 'PAGER' in os.environ:
- fp = os.popen(os['PAGER'], 'w')
+ fp = os.popen(os.environ['PAGER'], 'w')
else:
fp = ui
try: