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-rw-r--r--synapse/storage/search.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/synapse/storage/search.py b/synapse/storage/search.py
index fd7b688cf5..39f600f53c 100644
--- a/synapse/storage/search.py
+++ b/synapse/storage/search.py
@@ -419,5 +419,8 @@ def _parse_query(database_engine, search_term):
 
     if isinstance(database_engine, PostgresEngine):
         return " & ".join(result + ":*" for result in results)
-    else:
+    elif isinstance(database_engine, Sqlite3Engine):
         return " & ".join(result + "*" for result in results)
+    else:
+        # This should be unreachable.
+        raise Exception("Unrecognized database engine")