diff --git a/workflow/scripts/experiment_qc.py b/workflow/scripts/experiment_qc.py
index c5cd47caa9a57c67059ef0c7a074599b1c5605d3..d884eaf5c572607dbbf2a4c51e59dcea27fe7087 100644
--- a/workflow/scripts/experiment_qc.py
+++ b/workflow/scripts/experiment_qc.py
@@ -174,7 +174,7 @@ def main():
 
     # Run enrichment
     new_design_df = update_controls(design_df)
-    for row in new_design_df.iterrows():
+    for index, row in new_design_df.iterrows():
         check_enrichment(
             row['sample_id'],
             row['control_id'],