diff --git a/rslib/src/card/undo.rs b/rslib/src/card/undo.rs
index c0bb0a035..e83f096f7 100644
--- a/rslib/src/card/undo.rs
+++ b/rslib/src/card/undo.rs
@@ -35,6 +35,14 @@ impl Collection {
         Ok(())
     }
 
+    pub(crate) fn add_card_if_unique_undoable(&mut self, card: &Card) -> Result<bool> {
+        let added = self.storage.add_card_if_unique(card)?;
+        if added {
+            self.save_undo(UndoableCardChange::Added(Box::new(card.clone())));
+        }
+        Ok(added)
+    }
+
     pub(super) fn update_card_undoable(&mut self, card: &mut Card, original: Card) -> Result<()> {
         if card.id.0 == 0 {
             return Err(AnkiError::invalid_input("card id not set"));
diff --git a/rslib/src/import_export/package/apkg/import.rs b/rslib/src/import_export/package/apkg/import.rs
index 3956430b1..7acee2cd7 100644
--- a/rslib/src/import_export/package/apkg/import.rs
+++ b/rslib/src/import_export/package/apkg/import.rs
@@ -41,7 +41,6 @@ struct Context<'a> {
     remapped_notes: HashMap<NoteId, NoteId>,
     remapped_decks: HashMap<DeckId, DeckId>,
     remapped_deck_configs: HashMap<DeckConfigId, DeckConfigId>,
-    remapped_cards: HashMap<CardId, CardId>,
     data: ExchangeData,
     usn: Usn,
     /// Map of source media files, that do not already exist in the target.
@@ -52,6 +51,7 @@ struct Context<'a> {
     /// Source notes that cannot be imported, because notes with the same guid
     /// exist in the target, but their notetypes don't match.
     conflicting_notes: HashSet<NoteId>,
+    added_cards: HashSet<CardId>,
     normalize_notes: bool,
 }
 
@@ -139,7 +139,7 @@ impl<'a> Context<'a> {
             remapped_notes: HashMap::new(),
             remapped_decks: HashMap::new(),
             remapped_deck_configs: HashMap::new(),
-            remapped_cards: HashMap::new(),
+            added_cards: HashSet::new(),
             used_media_entries: HashMap::new(),
             normalize_notes,
         })
@@ -405,9 +405,15 @@ impl<'a> Context<'a> {
             self.remap_deck_id(&mut card);
             // TODO: adjust collection-relative due times
             // TODO: remove cards from filtered decks
-            let old_id = mem::take(&mut card.id);
-            self.target_col.add_card(&mut card)?;
-            self.remapped_cards.insert(old_id, card.id);
+            self.add_card(&mut card)?;
+        }
+        Ok(())
+    }
+
+    fn add_card(&mut self, card: &mut Card) -> Result<()> {
+        card.usn = self.usn;
+        if self.target_col.add_card_if_unique_undoable(card)? {
+            self.added_cards.insert(card.id);
         }
         Ok(())
     }
@@ -426,8 +432,7 @@ impl<'a> Context<'a> {
 
     fn import_revlog(&mut self) -> Result<()> {
         for mut entry in mem::take(&mut self.data.revlog) {
-            if let Some(cid) = self.remapped_cards.get(&entry.cid) {
-                entry.cid = *cid;
+            if self.added_cards.contains(&entry.cid) {
                 entry.usn = self.usn;
                 self.target_col.add_revlog_entry_undoable(entry)?;
             }
diff --git a/rslib/src/storage/card/add_card_if_unique.sql b/rslib/src/storage/card/add_card_if_unique.sql
new file mode 100644
index 000000000..80b3a6394
--- /dev/null
+++ b/rslib/src/storage/card/add_card_if_unique.sql
@@ -0,0 +1,41 @@
+INSERT
+  OR IGNORE INTO cards (
+    id,
+    nid,
+    did,
+    ord,
+    mod,
+    usn,
+    type,
+    queue,
+    due,
+    ivl,
+    factor,
+    reps,
+    lapses,
+    left,
+    odue,
+    odid,
+    flags,
+    data
+  )
+VALUES (
+    ?,
+    ?,
+    ?,
+    ?,
+    ?,
+    ?,
+    ?,
+    ?,
+    ?,
+    ?,
+    ?,
+    ?,
+    ?,
+    ?,
+    ?,
+    ?,
+    ?,
+    ?
+  )
\ No newline at end of file
diff --git a/rslib/src/storage/card/mod.rs b/rslib/src/storage/card/mod.rs
index ac77dd33a..0d3352c42 100644
--- a/rslib/src/storage/card/mod.rs
+++ b/rslib/src/storage/card/mod.rs
@@ -145,6 +145,34 @@ impl super::SqliteStorage {
         Ok(())
     }
 
+    /// Add card if id is unique. True if card was added.
+    pub(crate) fn add_card_if_unique(&self, card: &Card) -> Result<bool> {
+        self.db
+            .prepare_cached(include_str!("add_card_if_unique.sql"))?
+            .execute(params![
+                card.id,
+                card.note_id,
+                card.deck_id,
+                card.template_idx,
+                card.mtime,
+                card.usn,
+                card.ctype as u8,
+                card.queue as i8,
+                card.due,
+                card.interval,
+                card.ease_factor,
+                card.reps,
+                card.lapses,
+                card.remaining_steps,
+                card.original_due,
+                card.original_deck_id,
+                card.flags,
+                CardData::from_card(card),
+            ])
+            .map(|n_rows| n_rows == 1)
+            .map_err(Into::into)
+    }
+
     /// Add or update card, using the provided ID. Used for syncing & undoing.
     pub(crate) fn add_or_update_card(&self, card: &Card) -> Result<()> {
         let mut stmt = self.db.prepare_cached(include_str!("add_or_update.sql"))?;