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 7e1d19c0126c49ad0d14d53bddefcde74386e285..ee456ac7ac8cf2cdaa4ae3b168b81af71cd23ff2 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
@@ -34,7 +34,7 @@ def go(args):
         print("Filtering to MS only")
         df = df.loc[df.measurement_kind == "mass_spec"].copy()
 
-    if args.set_measurement_value:
+    if args.set_measurement_value is not None:
         indexer = df.measurement_kind == "mass_spec"
         df.loc[
             indexer,