diff --git a/pylib/anki/foreign_data/mnemosyne.py b/pylib/anki/foreign_data/mnemosyne.py
index 543b6f645..4ae3d7f5b 100644
--- a/pylib/anki/foreign_data/mnemosyne.py
+++ b/pylib/anki/foreign_data/mnemosyne.py
@@ -148,11 +148,11 @@ class MnemoCard:
             reps=self.reps,
             lapses=self.lapses,
             interval=self.anki_interval(),
-            due=self.next_rep,
+            due=int(self.next_rep),
         )
 
     def anki_interval(self) -> int:
-        return max(1, (self.next_rep - self.last_rep) // 86400)
+        return int(max(1, (self.next_rep - self.last_rep) // 86400))
 
 
 @dataclass