diff --git a/pylot/core/pick/utils.py b/pylot/core/pick/utils.py
index 5f72bd39..04f56d48 100644
--- a/pylot/core/pick/utils.py
+++ b/pylot/core/pick/utils.py
@@ -488,7 +488,7 @@ def getsignalwin(t, t1, tsignal):
     return isignal
 
 
-def getResolutionWindow(snr, extent):
+def getResolutionWindow(snr, extent='local'):
     """
     Number -> Float
     produce the half of the time resolution window width from given SNR