diff --git a/ranking/prepare_trec_eval_files.py b/ranking/prepare_trec_eval_files.py
index 6f2afaf..66b7445 100644
--- a/ranking/prepare_trec_eval_files.py
+++ b/ranking/prepare_trec_eval_files.py
@@ -45,8 +45,8 @@ def main():
 
     esci_label2relevance_pos = {
         "E" : 4,
-        "S" : 2,
-        "C" : 3,
+        "S" : 3,
+        "C" : 2,
         "I" : 1,
     }
 
@@ -134,4 +134,4 @@ def main():
     #../code/terrier-project-5.5/bin/terrier trec_eval ${QRELS_FILE} ${RES_FILE} -c -J -m 'ndcg.1=0,2=0.01,3=0.1,4=1'
 
 if __name__ == "__main__": 
-    main()
\ No newline at end of file
+    main()