diff --git a/borg/archive.py b/borg/archive.py
index 653e2dd1c..4498c72a3 100644
--- a/borg/archive.py
+++ b/borg/archive.py
@@ -39,7 +39,7 @@ HASH_MASK_BITS = 21  # results in ~2MiB chunks statistically
 CHUNKER_PARAMS = (CHUNK_MIN_EXP, CHUNK_MAX_EXP, HASH_MASK_BITS, HASH_WINDOW_SIZE)
 
 # chunker params for the items metadata stream, finer granularity
-ITEMS_CHUNKER_PARAMS = (12, 16, 14, HASH_WINDOW_SIZE)
+ITEMS_CHUNKER_PARAMS = (15, 19, 17, HASH_WINDOW_SIZE)
 
 has_lchmod = hasattr(os, 'lchmod')
 has_lchflags = hasattr(os, 'lchflags')