diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init__.py
index b29594d75e..b887540a55 100644
--- a/scripts/tracetool/__init__.py
+++ b/scripts/tracetool/__init__.py
@@ -91,7 +91,7 @@ ALLOWED_TYPES = [
 def validate_type(name):
     bits = name.split(" ")
     for bit in bits:
-        bit = re.sub("\*", "", bit)
+        bit = re.sub(r"\*", "", bit)
         if bit == "":
             continue
         if bit == "const":