diff --git a/galion_modbus/poll.py b/galion_modbus/poll.py
index 88f3010..fa7f412 100644
--- a/galion_modbus/poll.py
+++ b/galion_modbus/poll.py
@@ -42,3 +42,4 @@ def write_coil(host, port=502, unit=1, address=0, value=True):
         return not rr.isError()
     finally:
         c.close()
+fix timeout on slow RTUs