diff --git a/artiq/master/worker_db.py b/artiq/master/worker_db.py
index f0d87c086..1a4ef61e6 100644
--- a/artiq/master/worker_db.py
+++ b/artiq/master/worker_db.py
@@ -221,7 +221,7 @@ class DatasetManager:
                 index = slice(*index)
         setitem(target, index, value)
 
-    def get(self, key, archive):
+    def get(self, key, archive=False):
         if key in self.local:
             return self.local[key]
         else: