diff --git a/src/capport/database.py b/src/capport/database.py
index d4195be..ea62c9a 100644
--- a/src/capport/database.py
+++ b/src/capport/database.py
@@ -236,7 +236,7 @@ class Database:
 
         try:
             while True:
-                async with await trio.open_file(filename, 'ab') as sf:
+                async with await trio.open_file(filename, 'ab', buffering=0) as sf:
                     while True:
                         update = await rx.receive()
                         if isinstance(update, list):