diff --git a/piker/brokers/binance.py b/piker/brokers/binance.py
index 68c7238e..1e0f6cc4 100644
--- a/piker/brokers/binance.py
+++ b/piker/brokers/binance.py
@@ -388,6 +388,7 @@ async def open_history_client(
     async with open_cached_client('binance') as client:
 
         async def get_ohlc(
+            timeframe: float,
             end_dt: Optional[datetime] = None,
             start_dt: Optional[datetime] = None,