diff --git a/emulator/brainflow_emulator/galea_manual_v4.py b/emulator/brainflow_emulator/galea_manual_v4.py
index 59c83f3ab..03fea7a94 100644
--- a/emulator/brainflow_emulator/galea_manual_v4.py
+++ b/emulator/brainflow_emulator/galea_manual_v4.py
@@ -53,6 +53,8 @@ def run(self):
                     self.start_streaming_time
                 elif msg in Message.ack_values.value or msg.decode('utf-8').startswith('x'):
                     self.server_socket.sendto(Message.ack_from_device.value, self.addr)
+                elif msg in Message.ack_values.value or msg.decode('utf-8').startswith('z'):
+                    self.server_socket.sendto(Message.ack_from_device.value, self.addr)
                 elif msg == Message.time_calc_command.value:
                     cur_time = time.time()
                     resp = bytearray(struct.pack('d', (cur_time - start_time) * 1000))