diff --git a/bluepyefe/ecode/sineSpec.py b/bluepyefe/ecode/sineSpec.py
index 0c31d87..2a122f7 100644
--- a/bluepyefe/ecode/sineSpec.py
+++ b/bluepyefe/ecode/sineSpec.py
@@ -95,7 +95,7 @@ def interpret(self, t, current, config_data, reader_data):
         if "toff" in config_data and config_data["toff"] is not None:
             self.toff = int(round(config_data["toff"] / self.dt))
         else:
-            self.ton = 5100
+            self.toff = 5100
             logger.warning(
                 "As toff was not specified for protocol {}, it will "
                 "be set to 5100ms.".format(self.protocol_name)