diff --git a/bam_filter/utils.py b/bam_filter/utils.py
index 5520e39..971ff02 100644
--- a/bam_filter/utils.py
+++ b/bam_filter/utils.py
@@ -140,7 +140,7 @@ def is_valid_file(parser, arg, var):
     "min_read_length": 30,
     "min_read_count": 10,
     "min_expected_breadth_ratio": 0.5,
-    "min_norm_entropy": "auto",
+    "min_norm_entropy": None,
     "min_norm_gini": None,
     "min_avg_read_ani": 90.0,
     "min_read_ani": 90.0,