diff --git a/llvm/utils/UpdateTestChecks/common.py b/llvm/utils/UpdateTestChecks/common.py
index 75c6e43855633..4a02a92f824e6 100644
--- a/llvm/utils/UpdateTestChecks/common.py
+++ b/llvm/utils/UpdateTestChecks/common.py
@@ -485,7 +485,7 @@ def invoke_tool(exe, cmd_args, ir, preprocess_cmd=None, verbose=False):
 )
 
 UTC_ARGS_KEY = "UTC_ARGS:"
-UTC_ARGS_CMD = re.compile(r".*" + UTC_ARGS_KEY + "\s*(?P<cmd>.*)\s*$")
+UTC_ARGS_CMD = re.compile(r".*" + UTC_ARGS_KEY + r"\s*(?P<cmd>.*)\s*$")
 UTC_ADVERT = "NOTE: Assertions have been autogenerated by "
 UTC_AVOID = "NOTE: Do not autogenerate"
 UNUSED_NOTE = "NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:"