diff --git a/downloads-generation/models_class1/GENERATE.sh b/downloads-generation/models_class1/GENERATE.sh
index a38faa4887715f7abf7a865074062126f224f074..68a1db108ccfd4cb4d16595ea12cc283c07e0ca1 100755
--- a/downloads-generation/models_class1/GENERATE.sh
+++ b/downloads-generation/models_class1/GENERATE.sh
@@ -31,6 +31,7 @@ time mhcflurry-class1-train-allele-specific-models \
     --data "$(mhcflurry-downloads path data_curated)/curated_training_data.csv.bz2" \
     --hyperparameters hyperparameters.yaml \
     --out-models-dir models \
+    --percent-rank-calibration-num-peptides-per-length 1000000 \
     --min-measurements-per-allele 100
 
 cp $SCRIPT_ABSOLUTE_PATH .