diff --git a/tests/test_utils_pv.py b/tests/test_utils_pv.py
index 96a8e441..58db8136 100644
--- a/tests/test_utils_pv.py
+++ b/tests/test_utils_pv.py
@@ -21,7 +21,8 @@ def fake_epics_pv(monkeypatch):
             old = self._value
             self._value = value
             for cb in self._callbacks.values():
-                cb(value, old=old, **kwargs)
+                cb(value=value, old=old, **kwargs)
+
                 
         def add_callback(self, callback):
             cb_id = len(self._callbacks) + 1