diff --git a/src/nominatim_db/indexer/indexer.py b/src/nominatim_db/indexer/indexer.py
index ccbbf117..344fee72 100644
--- a/src/nominatim_db/indexer/indexer.py
+++ b/src/nominatim_db/indexer/indexer.py
@@ -59,7 +59,7 @@ class Indexer:
                 if await self.index_by_rank(0, 4) > 0:
                     _analyze()
 
-                if await self.index_boundaries(0, 30) > 100:
+                if await self.index_boundaries() > 100:
                     _analyze()
 
                 if await self.index_by_rank(5, 25) > 100:
@@ -74,7 +74,7 @@ class Indexer:
                 if not self.has_pending():
                     break
 
-    async def index_boundaries(self, minrank: int, maxrank: int) -> int:
+    async def index_boundaries(self, minrank: int = 0, maxrank: int = 30) -> int:
         """ Index only administrative boundaries within the given rank range.
         """
         total = 0
diff --git a/test/python/indexer/test_indexing.py b/test/python/indexer/test_indexing.py
index 54299a96..947403b1 100644
--- a/test/python/indexer/test_indexing.py
+++ b/test/python/indexer/test_indexing.py
@@ -247,7 +247,7 @@ async def test_index_boundaries(test_db, threads, test_tokenizer):
     assert test_db.osmline_unindexed() == 1
 
     idx = indexer.Indexer('dbname=test_nominatim_python_unittest', test_tokenizer, threads)
-    await idx.index_boundaries(0, 30)
+    await idx.index_boundaries()
 
     assert test_db.placex_unindexed() == 31
     assert test_db.osmline_unindexed() == 1