diff --git a/mining/interfaces.py b/mining/interfaces.py
index 0370d06..cf13cd6 100644
--- a/mining/interfaces.py
+++ b/mining/interfaces.py
@@ -17,7 +17,7 @@ dbi.init_main()
 
 class WorkerManagerInterface(object):
     def __init__(self):
-	self.worker_log = {}
+        self.worker_log = {}
         self.worker_log.setdefault('authorized', {})
         return