diff --git a/geomagio/edge/MiniSeedInputClient.py b/geomagio/edge/MiniSeedInputClient.py
index 65949dd8dd2709e921ddaedce7949e942b059b2d..122b1eb4ec657b339e580a0d0025042bada5f680 100644
--- a/geomagio/edge/MiniSeedInputClient.py
+++ b/geomagio/edge/MiniSeedInputClient.py
@@ -71,6 +71,6 @@ class MiniSeedInputClient(object):
             self.connect()
         # convert stream to miniseed
         buf = io.BytesIO()
-        stream.write(buf, format="MSEED")
+        stream.write(buf, format="MSEED", reclen=512)
         # send data
         self.socket.sendall(buf.getvalue())