diff --git a/rslib/src/decks/mod.rs b/rslib/src/decks/mod.rs
index b7602d170..2078eac78 100644
--- a/rslib/src/decks/mod.rs
+++ b/rslib/src/decks/mod.rs
@@ -5,6 +5,7 @@ mod counts;
 mod current;
 mod filtered;
 mod name;
+mod reparent;
 mod schema11;
 mod tree;
 pub(crate) mod undo;
@@ -32,7 +33,7 @@ use crate::{
 pub(crate) use counts::DueCounts;
 use name::normalize_native_name;
 pub(crate) use name::{
-    human_deck_name_to_native, immediate_parent_name, native_deck_name_to_human, reparented_name,
+    human_deck_name_to_native, immediate_parent_name, native_deck_name_to_human,
 };
 pub use schema11::DeckSchema11;
 use std::{borrow::Cow, sync::Arc};
@@ -483,59 +484,6 @@ impl Collection {
         deck.set_modified(usn);
         self.update_single_deck_undoable(deck, original)
     }
-
-    pub fn reparent_decks(
-        &mut self,
-        deck_ids: &[DeckId],
-        new_parent: Option<DeckId>,
-    ) -> Result<OpOutput<usize>> {
-        self.transact(Op::ReparentDeck, |col| {
-            col.reparent_decks_inner(deck_ids, new_parent)
-        })
-    }
-
-    pub fn reparent_decks_inner(
-        &mut self,
-        deck_ids: &[DeckId],
-        new_parent: Option<DeckId>,
-    ) -> Result<usize> {
-        let usn = self.usn()?;
-        let target_deck;
-        let mut target_name = None;
-        if let Some(target) = new_parent {
-            if let Some(target) = self.storage.get_deck(target)? {
-                if target.is_filtered() {
-                    return Err(FilteredDeckError::MustBeLeafNode.into());
-                }
-                target_deck = target;
-                target_name = Some(target_deck.name.as_str());
-            }
-        }
-
-        let mut count = 0;
-        for deck in deck_ids {
-            if let Some(mut deck) = self.storage.get_deck(*deck)? {
-                if let Some(new_name) = reparented_name(&deck.name, target_name) {
-                    count += 1;
-                    let orig = deck.clone();
-
-                    // this is basically update_deck_inner(), except:
-                    // - we skip the normalization in prepare_for_update()
-                    // - we skip the match_or_create_parents() step
-                    // - we skip the final create_missing_parents(), as we don't allow parent->child
-                    //   renames
-
-                    deck.set_modified(usn);
-                    deck.name = new_name;
-                    self.ensure_deck_name_unique(&mut deck, usn)?;
-                    self.rename_child_decks(&orig, &deck.name, usn)?;
-                    self.update_single_deck_undoable(&mut deck, orig)?;
-                }
-            }
-        }
-
-        Ok(count)
-    }
 }
 
 #[cfg(test)]
diff --git a/rslib/src/decks/reparent.rs b/rslib/src/decks/reparent.rs
new file mode 100644
index 000000000..97186953c
--- /dev/null
+++ b/rslib/src/decks/reparent.rs
@@ -0,0 +1,59 @@
+// Copyright: Ankitects Pty Ltd and contributors
+// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
+use super::name::reparented_name;
+use crate::{error::FilteredDeckError, prelude::*};
+
+impl Collection {
+    pub fn reparent_decks(
+        &mut self,
+        deck_ids: &[DeckId],
+        new_parent: Option<DeckId>,
+    ) -> Result<OpOutput<usize>> {
+        self.transact(Op::ReparentDeck, |col| {
+            col.reparent_decks_inner(deck_ids, new_parent)
+        })
+    }
+
+    pub fn reparent_decks_inner(
+        &mut self,
+        deck_ids: &[DeckId],
+        new_parent: Option<DeckId>,
+    ) -> Result<usize> {
+        let usn = self.usn()?;
+        let target_deck;
+        let mut target_name = None;
+        if let Some(target) = new_parent {
+            if let Some(target) = self.storage.get_deck(target)? {
+                if target.is_filtered() {
+                    return Err(FilteredDeckError::MustBeLeafNode.into());
+                }
+                target_deck = target;
+                target_name = Some(target_deck.name.as_str());
+            }
+        }
+
+        let mut count = 0;
+        for deck in deck_ids {
+            if let Some(mut deck) = self.storage.get_deck(*deck)? {
+                if let Some(new_name) = reparented_name(&deck.name, target_name) {
+                    count += 1;
+                    let orig = deck.clone();
+
+                    // this is basically update_deck_inner(), except:
+                    // - we skip the normalization in prepare_for_update()
+                    // - we skip the match_or_create_parents() step
+                    // - we skip the final create_missing_parents(), as we don't allow parent->child
+                    //   renames
+
+                    deck.set_modified(usn);
+                    deck.name = new_name;
+                    self.ensure_deck_name_unique(&mut deck, usn)?;
+                    self.rename_child_decks(&orig, &deck.name, usn)?;
+                    self.update_single_deck_undoable(&mut deck, orig)?;
+                }
+            }
+        }
+
+        Ok(count)
+    }
+}