--- a/toolkit/components/places/SyncedBookmarksMirror.jsm
+++ b/toolkit/components/places/SyncedBookmarksMirror.jsm
@@ -1793,21 +1793,16 @@ async function initializeMirrorDatabase(
   await db.execute(`CREATE TABLE mirror.tags(
     itemId INTEGER NOT NULL REFERENCES items(id)
                             ON DELETE CASCADE,
     tag TEXT NOT NULL
   )`);
 
   await db.execute(`CREATE INDEX mirror.urlHashes ON urls(hash)`);
 
-  await db.execute(`CREATE INDEX mirror.locations ON structure(
-    parentGuid,
-    position
-  )`);
-
   await createMirrorRoots(db);
 }
 
 /**
  * Sets up the syncable roots. All items in the mirror should descend from these
  * roots. If we ever add new syncable roots to Places, this function should also
  * be updated to create them in the mirror.
  *