diff --git a/pysteps/verification/interface.py b/pysteps/verification/interface.py
index c38a55def..6e325f6f4 100644
--- a/pysteps/verification/interface.py
+++ b/pysteps/verification/interface.py
@@ -172,6 +172,7 @@ def get_method(name, type="deterministic"):
         # categorical
         if name in [
             "acc",
+            "bias",
             "csi",
             "f1",
             "fa",