diff --git a/pythonbuild/cpython.py b/pythonbuild/cpython.py
index f339037c..c52f7ce6 100644
--- a/pythonbuild/cpython.py
+++ b/pythonbuild/cpython.py
@@ -672,7 +672,7 @@ def derive_setup_local(
     }
 
 
-RE_INITTAB_ENTRY = re.compile('\{"([^"]+)", ([^\}]+)\},')
+RE_INITTAB_ENTRY = re.compile(r'\{"([^"]+)", ([^\}]+)\},')
 
 
 def parse_config_c(s: str):