diff --git a/neon/transforms/cost.py b/neon/transforms/cost.py
index cb714020..9e9125b6 100644
--- a/neon/transforms/cost.py
+++ b/neon/transforms/cost.py
@@ -438,7 +438,7 @@ def __init__(self, num_classes, binarize=False, epsilon=1e-6):
             self.bin_buf = None
         self.eps = epsilon
 
-    def __call__(self, y, t):
+    def __call__(self, y, t, calcrange=slice(0, None)):
         """
         Returns a numpy array with the precision and recall metrics.