diff --git a/tools/device.py b/tools/device.py
index 55cf3a75f77cc0343698d0cf1128cbef0044774f..9ec9edf4e91e6bcdb6a5a5168a7b572be1795f26 100644
--- a/tools/device.py
+++ b/tools/device.py
@@ -243,7 +243,8 @@ class DeviceWrapper:
                     "--model_file=%s" % mace_model_path,
                 ],
                 stderr=subprocess.PIPE,
-                stdout=subprocess.PIPE)
+                stdout=subprocess.PIPE,
+                universal_newlines=True)
             out, err = p.communicate()
             self.stdout = err + out
             six.print_(self.stdout)