diff --git a/changelog.d/17817.bugfix b/changelog.d/17817.bugfix
new file mode 100644
index 00000000000..5dd276709b0
--- /dev/null
+++ b/changelog.d/17817.bugfix
@@ -0,0 +1 @@
+Avoid lost data on some database query retries.
diff --git a/synapse/storage/databases/main/search.py b/synapse/storage/databases/main/search.py
index b436275f3fd..1d5c5e72ffc 100644
--- a/synapse/storage/databases/main/search.py
+++ b/synapse/storage/databases/main/search.py
@@ -94,7 +94,7 @@ def store_search_entries_txn(
             VALUES (?,?,?,to_tsvector('english', ?),?,?)
             """
 
-            args1 = (
+            args1 = [
                 (
                     entry.event_id,
                     entry.room_id,
@@ -104,7 +104,7 @@ def store_search_entries_txn(
                     entry.origin_server_ts,
                 )
                 for entry in entries
-            )
+            ]
 
             txn.execute_batch(sql, args1)