diff --git a/src/calng/base_calcat.py b/src/calng/base_calcat.py
index 0061c92cb6e97471b0aa2a1d20b5fd75901a0aeb..85d5bbdde74faf75d90f992cd18e111f8a1a8664 100644
--- a/src/calng/base_calcat.py
+++ b/src/calng/base_calcat.py
@@ -611,7 +611,7 @@ class BaseCalcatFriend:
         # TODO: warn user about all the things that go wrong
         def aux():
             with self.api_lock:
-                data = self.get_overriden_constant_version(constant)
+                data = self.get_overridden_constant_version(constant)
             callback(constant, data)
 
         thread = threading.Thread(target=aux)