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-rw-r--r--testing/mozbase/mozrunner/mozrunner/devices/base.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/testing/mozbase/mozrunner/mozrunner/devices/base.py b/testing/mozbase/mozrunner/mozrunner/devices/base.py
index 6197b0d6ce..05eb61ca86 100644
--- a/testing/mozbase/mozrunner/mozrunner/devices/base.py
+++ b/testing/mozbase/mozrunner/mozrunner/devices/base.py
@@ -118,7 +118,7 @@ class Device(object):
# The file will still be deleted at the end of the `with` block.
# See the "Opening the temporary file again" paragraph in:
# https://docs.python.org/3/library/tempfile.html#tempfile.NamedTemporaryFile
- with tempfile.NamedTemporaryFile(delete=False) as new_profiles_ini:
+ with tempfile.NamedTemporaryFile(mode="w", delete=False) as new_profiles_ini:
config.write(new_profiles_ini)
self.backup_file(self.app_ctx.remote_profiles_ini)
self.device.push(new_profiles_ini.name, self.app_ctx.remote_profiles_ini)