diff --git a/yamale/validators/validators.py b/yamale/validators/validators.py
index 03259d9..20fbb7a 100644
--- a/yamale/validators/validators.py
+++ b/yamale/validators/validators.py
@@ -243,8 +243,8 @@ class Mac(Regex):
     def __init__(self, *args, **kwargs):
         super(Mac, self).__init__(*args, **kwargs)
         self.regexes = [
-            re.compile(r"[0-9a-fA-F]{2}([-:]?)[0-9a-fA-F]{2}(\\1[0-9a-fA-F]{2}){4}$"),
-            re.compile(r"[0-9a-fA-F]{4}([-:]?)[0-9a-fA-F]{4}(\\1[0-9a-fA-F]{4})$"),
+            re.compile(r"[0-9a-fA-F]{2}([-:]?)[0-9a-fA-F]{2}(\1[0-9a-fA-F]{2}){4}$"),
+            re.compile(r"[0-9a-fA-F]{4}([-:]?)[0-9a-fA-F]{4}(\1[0-9a-fA-F]{4})$"),
         ]