diff --git a/geomagio/edge/MiniSeedInputClient.py b/geomagio/edge/MiniSeedInputClient.py
index b273604a63fe0ce386f4851216982b63d25544ff..0edc200008e25bccfd374f4c3bc10d31f31194f8 100644
--- a/geomagio/edge/MiniSeedInputClient.py
+++ b/geomagio/edge/MiniSeedInputClient.py
@@ -78,7 +78,9 @@ class MiniSeedInputClient(object):
         buf = io.BytesIO()
         streams = self._pre_process(stream)
         for stream in streams:
-            stream.write(buf, format="MSEED", reclen=512)
+            stream.write(
+                buf, encoding=self.encoding.upper(), format="MSEED", reclen=512
+            )
         # send data
         self.socket.sendall(buf.getvalue())