diff --git a/poky/scripts/patchtest-get-branch b/poky/scripts/patchtest-get-branch
index b5fb2b0..c6e242f 100755
--- a/poky/scripts/patchtest-get-branch
+++ b/poky/scripts/patchtest-get-branch
@@ -16,7 +16,7 @@
 import re
 import git
 
-re_prefix = re.compile("(\[.*\])", re.DOTALL)
+re_prefix = re.compile(r"(\[.*\])", re.DOTALL)
 
 def get_branch(filepath_repo, filepath_mbox, default_branch):
     branch = None