--- a/testing/mozbase/mozrunner/mozrunner/devices/emulator.py
+++ b/testing/mozbase/mozrunner/mozrunner/devices/emulator.py
@@ -155,16 +155,17 @@ class BaseEmulator(Device):
     def cleanup(self):
         """
         Cleans up and kills the emulator, if it was started by mozrunner.
         """
         super(BaseEmulator, self).cleanup()
         if self.proc:
             self.proc.kill()
             self.proc = None
+            self.connected = False
 
         # Remove temporary files
         shutil.rmtree(self.tmpdir)
 
     def _get_telnet_response(self, command=None):
         output = []
         assert self.telnet
         if command is not None: