diff --git a/caravel/models.py b/caravel/models.py
index 4abc2a01426e..9d234858a22c 100644
--- a/caravel/models.py
+++ b/caravel/models.py
@@ -1160,7 +1160,7 @@ def query(  # druid
             if df is not None and not df.empty:
                 dims = qry['dimensions']
                 filters = []
-                for _, row in df.iterrows():
+                for unused, row in df.iterrows():
                     fields = []
                     for dim in dims:
                         f = Filter.build_filter(Dimension(dim) == row[dim])