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-rw-r--r--testing/marionette/harness/marionette_harness/runner/base.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/testing/marionette/harness/marionette_harness/runner/base.py b/testing/marionette/harness/marionette_harness/runner/base.py
index b5ddc2d788..a042ac01ab 100644
--- a/testing/marionette/harness/marionette_harness/runner/base.py
+++ b/testing/marionette/harness/marionette_harness/runner/base.py
@@ -730,7 +730,7 @@ class BaseMarionetteTestRunner(object):
@property
def filename_pattern(self):
if self._filename_pattern is None:
- self._filename_pattern = re.compile("^test(((_.+?)+?\.((py))))$")
+ self._filename_pattern = re.compile(r"^test(((_.+?)+?\.((py))))$")
return self._filename_pattern