diff --git a/rslib/src/scheduler/fsrs/simulator.rs b/rslib/src/scheduler/fsrs/simulator.rs
index c1f4df817..005f7ca86 100644
--- a/rslib/src/scheduler/fsrs/simulator.rs
+++ b/rslib/src/scheduler/fsrs/simulator.rs
@@ -142,10 +142,11 @@ impl Collection {
         // calculate any missing memory state
         for c in &mut cards {
             if is_included_card(c) && c.memory_state.is_none() {
-                let original = c.clone();
-                let new_state = self.compute_memory_state(c.id)?.state;
-                c.memory_state = new_state.map(Into::into);
-                self.update_card_inner(c, original, self.usn()?)?;
+                let fsrs_data = self.compute_memory_state(c.id)?;
+                c.memory_state = fsrs_data.state.map(Into::into);
+                c.desired_retention = Some(fsrs_data.desired_retention);
+                c.decay = Some(fsrs_data.decay);
+                self.storage.update_card(c)?;
             }
         }
         let days_elapsed = self.timing_today().unwrap().days_elapsed as i32;