diff --git a/downloads-generation/models_class1_pan_variants/reassign_mass_spec_training_data.py b/downloads-generation/models_class1_pan_variants/reassign_mass_spec_training_data.py
index 71c42693d24d04be564a32343b91fc6c73848f92..158384193479a248c47f9e90434217f780fc3270 100644
--- a/downloads-generation/models_class1_pan_variants/reassign_mass_spec_training_data.py
+++ b/downloads-generation/models_class1_pan_variants/reassign_mass_spec_training_data.py
@@ -21,9 +21,10 @@ def go(args):
     df = pandas.read_csv(args.data)
     print(df)
 
-    bad = (
-        df.loc[df.measurement_kind == "mass_spec"].measurement_inequality
-        != "<")
+    bad = df.loc[
+        (df.measurement_kind == "mass_spec") &
+        (df.measurement_inequality != "<")
+    ]
     assert len(bad) == 0, bad
 
     if args.ms_only: