diff --git a/zipline/data/us_equity_pricing.py b/zipline/data/us_equity_pricing.py
index 0cfdd700a5..b21210e8a1 100644
--- a/zipline/data/us_equity_pricing.py
+++ b/zipline/data/us_equity_pricing.py
@@ -160,7 +160,7 @@ def winsorise_uint32(df, invalid_data_behavior, column, *columns):
                 stacklevel=3,  # one extra frame for `expect_element`
             )
 
-    df[mask] = 0
+    df = df.where(~mask, other=0)
     return df