diff --git a/pslab/connection/wlan.py b/pslab/connection/wlan.py
index 15f2afe..79cde7a 100644
--- a/pslab/connection/wlan.py
+++ b/pslab/connection/wlan.py
@@ -106,7 +106,7 @@ def write(self, data: bytes) -> int:
         sent = 0
 
         while remaining > 0:
-            chunk = data[sent : min(remaining, buf_size)]
+            chunk = data[sent : sent + min(remaining, buf_size)]
             sent += self._sock.send(chunk)
             remaining -= len(chunk)