diff --git a/models.py b/models.py
index 2034169b..32f5176b 100755
--- a/models.py
+++ b/models.py
@@ -87,8 +87,9 @@ def create_modules(module_defs, img_size, arc):
 
             # Initialize preceding Conv2d() bias (https://arxiv.org/pdf/1708.02002.pdf section 3.3)
             try:
+                p = math.log(1 / (modules.nc - 1))  # class probability  ->  sigmoid(p) = 1/nc
                 if arc == 'default' or arc == 'Fdefault':  # default
-                    b = [-3.0, -6.0]  # obj, cls
+                    b = [-5.0, p]  # obj, cls
                 elif arc == 'uBCE':  # unified BCE (80 classes)
                     b = [0, -9.0]
                 elif arc == 'uCE':  # unified CE (1 background + 80 classes)