diff --git a/piker/brokers/ib/venues.py b/piker/brokers/ib/venues.py
index ea561d86..cd2dc7b1 100644
--- a/piker/brokers/ib/venues.py
+++ b/piker/brokers/ib/venues.py
@@ -83,7 +83,14 @@ def has_holiday(
     '''
     tz: str = con_deats.timeZoneId
     exch: str = con_deats.contract.primaryExchange
-    cal: ExchangeCalendar = xcals.get_calendar(exch)
+
+    # XXX, ad-hoc handle any IB exchange which are non-std
+    # via lookup table..
+    std_exch: dict = {
+        'ARCA': 'ARCX',
+    }.get(exch, exch)
+
+    cal: ExchangeCalendar = xcals.get_calendar(std_exch)
     end: datetime = period.end
     # _start: datetime = period.start
     # ?TODO, can rm ya?