diff --git a/src/calibre/db/backend.py b/src/calibre/db/backend.py
index 389db05c84..82e6fb39df 100644
--- a/src/calibre/db/backend.py
+++ b/src/calibre/db/backend.py
@@ -1282,6 +1282,8 @@ class DB:
 
     def vacuum(self):
         self.execute('VACUUM')
+        if self.fts_enabled:
+            self.fts.vacuum()
 
     @property
     def user_version(self):
diff --git a/src/calibre/db/fts/connect.py b/src/calibre/db/fts/connect.py
index 6de2e37571..2912b0b7a1 100644
--- a/src/calibre/db/fts/connect.py
+++ b/src/calibre/db/fts/connect.py
@@ -20,7 +20,6 @@ from .pool import Pool
 from .schema_upgrade import SchemaUpgrade
 
 # TODO: calibre export/import should preserve indexed data
-# TODO: check library and vacuuming of fts db
 
 
 def print(*args, **kwargs):
@@ -80,6 +79,10 @@ class FTS:
         conn = self.get_connection()
         conn.execute('DELETE FROM fts_db.dirtied_formats')
 
+    def vacuum(self):
+        conn = self.get_connection()
+        conn.execute('VACUUM')
+
     def remove_dirty(self, book_id, fmt):
         conn = self.get_connection()
         conn.execute('DELETE FROM fts_db.dirtied_formats WHERE book=? AND format=?', (book_id, fmt.upper()))