diff -r 38637dd39cfd -r 375577785f49 hgext/blackbox.py
--- a/hgext/blackbox.py	Sun Oct 22 23:52:22 2017 +0530
+++ b/hgext/blackbox.py	Sun Oct 22 23:52:47 2017 +0530
@@ -226,7 +226,7 @@
     if not repo.vfs.exists('blackbox.log'):
         return
 
-    limit = opts.get('limit')
+    limit = opts.get(r'limit')
     fp = repo.vfs('blackbox.log', 'r')
     lines = fp.read().split('\n')