diff --git a/workspace_tools/host_tests/host_test.py b/workspace_tools/host_tests/host_test.py
index 1ec542ebc6..9b70082d00 100644
--- a/workspace_tools/host_tests/host_test.py
+++ b/workspace_tools/host_tests/host_test.py
@@ -100,7 +100,7 @@ class Mbed:
         self.timeout = self.DEFAULT_TOUT if self.options.timeout is None else self.options.timeout
         print 'Host test instrumentation on port: "%s" and disk: "%s"' % (self.port, self.disk)
 
-    def init_serial(self, baud=9600, extra_baud=9600):
+    def init_serial(self, baud=9600):
         """ Initialize serial port. Function will return error is port can't be opened or initialized
         """
         result = True