diff --git a/sysexecution/tick_data.py b/sysexecution/tick_data.py
index 66dd21e47f..42ab3b2520 100644
--- a/sysexecution/tick_data.py
+++ b/sysexecution/tick_data.py
@@ -92,7 +92,7 @@ def extract_nth_row_of_tick_data_frame(
     bid_price = filled_data.bid_price.values[row_id]
     ask_price = filled_data.ask_price.values[row_id]
     bid_size = filled_data.bid_size.values[row_id]
-    ask_size = filled_data.ask_siz.valuese[row_id]
+    ask_size = filled_data.ask_size.values[row_id]
 
     return oneTick(bid_price, ask_price, bid_size, ask_size)