diff --git a/src/calibre/db/tests/fts_api.py b/src/calibre/db/tests/fts_api.py
index 0f9f7014ce..61f1df8eb4 100644
--- a/src/calibre/db/tests/fts_api.py
+++ b/src/calibre/db/tests/fts_api.py
@@ -144,6 +144,7 @@ class FTSAPITest(BaseTest):
         self.ae({x['text'] for x in cache.fts_search('also', highlight_start='[', highlight_end=']', snippet_size=3)}, {
             '…will [also] help…'})
         fts = cache.reindex_fts()
+        self.assertTrue(fts.pool.initialized)
         self.wait_for_fts_to_finish(fts)
         self.assertFalse(fts.all_currently_dirty())
         self.ae({x['id'] for x in cache.fts_search('help')}, {1, 2})