diff --git a/search_eval.py b/search_eval.py
index 6996cba..a2d6d5c 100755
--- a/search_eval.py
+++ b/search_eval.py
@@ -11,7 +11,9 @@ def load_ranker(cfg_file):
     The parameter to this function, cfg_file, is the path to a
     configuration file used to load the index.
     """
-    return metapy.index.OkapiBM25()
+    ranker = metapy.index.OkapiBM25(k1=1.3,b=0.75,k3=500)
+    return ranker
+    #return metapy.index.OkapiBM25()
 
 if __name__ == '__main__':
     if len(sys.argv) != 2: