diff --git a/python/makefile.py b/python/makefile.py
index 45f032296f3b..45db841c73ea 100644
--- a/python/makefile.py
+++ b/python/makefile.py
@@ -52,7 +52,7 @@
                 "grep",
                 "-l",
                 "-P",
-                "^#\s*include.*_clippy.c",
+                r"^#\s*include.*_clippy.c",
                 "--",
                 "**.c",
             ]