diff --git a/src/centpkg/__init__.py b/src/centpkg/__init__.py
index f614d33..1de8b59 100644
--- a/src/centpkg/__init__.py
+++ b/src/centpkg/__init__.py
@@ -171,7 +171,7 @@ class Commands(Commands):
         # For MD5 we want to use the old format of source files, the BSD format
         # should only be used when configured for SHA512
         self.source_entry_type = "bsd" if self.lookasidehash != "md5" else "old"
-        self.branchre = "c\d{1,}(s)?(tream)?|master"
+        self.branchre = r"c\d{1,}(s)?(tream)?|master"
 
     @property
     def distgitdir(self):