diff --git a/bluepyefe/protocol.py b/bluepyefe/protocol.py
index 7bb267e..d1b2176 100644
--- a/bluepyefe/protocol.py
+++ b/bluepyefe/protocol.py
@@ -193,7 +193,7 @@ def reduce_ecode(self, ecode, operator):
                 amp_rel = operator([c["amp_rel"] for c in params])
                 mean_param = float(amp_rel) * self.global_rheobase / 100.
             elif key == "amp2" and self.global_rheobase:
-                amp_rel2 = operator([c["amp_rel2"] for c in params])
+                amp_rel2 = operator([c["amp2_rel"] for c in params])
                 mean_param = float(amp_rel2) * self.global_rheobase / 100.
             else:
                 mean_param = operator([numpy.nan if c[key] is None else c[key] for c in params])