diff --git a/artiq/gateware/serwb/etherbone.py b/artiq/gateware/serwb/etherbone.py
index d69baf923..3d869d889 100644
--- a/artiq/gateware/serwb/etherbone.py
+++ b/artiq/gateware/serwb/etherbone.py
@@ -414,7 +414,7 @@ class _EtherboneRecordDepacketizer(_Depacketizer):
 
 
 class _EtherboneRecordReceiver(Module):
-    def __init__(self, buffer_depth=256):
+    def __init__(self, buffer_depth=16):
         self.sink = sink = stream.Endpoint(etherbone_record_description(32))
         self.source = source = stream.Endpoint(etherbone_mmap_description(32))
 
@@ -497,7 +497,7 @@ class _EtherboneRecordReceiver(Module):
 
 
 class _EtherboneRecordSender(Module):
-    def __init__(self, buffer_depth=256):
+    def __init__(self, buffer_depth=16):
         self.sink = sink = stream.Endpoint(etherbone_mmap_description(32))
         self.source = source = stream.Endpoint(etherbone_record_description(32))