diff --git a/cooltools/api/rearrange.py b/cooltools/api/rearrange.py
index 1de7403..82fd05f 100644
--- a/cooltools/api/rearrange.py
+++ b/cooltools/api/rearrange.py
@@ -212,6 +212,6 @@ def rearrange_cooler(
         ),
         assembly=assembly,
         mode=mode,
-        mergebuf=int(1e9),
+        mergebuf=int(2e7),
     )
     logging.info(f"Created a new cooler at {out_cooler}")