diff --git a/src/ntfc/device/sim.py b/src/ntfc/device/sim.py
index d4ebeb5..c48c94a 100644
--- a/src/ntfc/device/sim.py
+++ b/src/ntfc/device/sim.py
@@ -35,9 +35,6 @@
 class DeviceSim(DeviceHost):
     """This class implements host-based sim emulator."""
 
-    # sometimes sim misses a single trailing newline, so send two
-    NEWLINE_PAD = b"\n\n"
-
     def __init__(self, conf: "CoreConfig"):
         """Initialize sim emulator device."""
         DeviceHost.__init__(self, conf)
diff --git a/tests/device/test_sim.py b/tests/device/test_sim.py
index b4397ae..fdf8628 100644
--- a/tests/device/test_sim.py
+++ b/tests/device/test_sim.py
@@ -86,8 +86,7 @@ def send(self, data):
         sim._child = FakeChild()
 
         sim._write(b"abc")
-        assert sent[:3] == [b"a", b"b", b"c"]
-        assert sent[-2:] == [b"\n", b"\n"]
+        assert sent == [b"a", b"b", b"c", b"\n"]
 
 
 def test_device_sim_write_no_extra_newline():
@@ -134,7 +133,7 @@ def send(self, data):
         sim._child = FakeChild()
 
         sim._write(b"abc")
-        assert sent == [b"abc\n\n"]
+        assert sent == [b"abc\n"]
 
         sent.clear()
         sim._write(b"abc\n")