diff --git a/precise/functions.py b/precise/functions.py
index 12fb6de..3bfeec5 100644
--- a/precise/functions.py
+++ b/precise/functions.py
@@ -25,7 +25,8 @@ def weighted_log_loss(yt, yp) -> Any:
 
     pos_loss = -(0 + yt) * K.log(0 + yp + K.epsilon())
     neg_loss = -(1 - yt) * K.log(1 - yp + K.epsilon())
-    return weight * K.sum(neg_loss) + (1. - weight) * K.sum(pos_loss)
+
+    return weight * K.mean(neg_loss) + (1. - weight) * K.mean(pos_loss)
 
 
 def weighted_mse_loss(yt, yp) -> Any: