diff --git a/src/tinycss/color3.py b/src/tinycss/color3.py
index 187196e7a0..e0cb0bda48 100644
--- a/src/tinycss/color3.py
+++ b/src/tinycss/color3.py
@@ -188,8 +188,8 @@ def parse_comma_separated(tokens):
 
 
 HASH_REGEXPS = (
-    (2, re.compile('^#([\da-f])([\da-f])([\da-f])$', re.I).match),
-    (1, re.compile('^#([\da-f]{2})([\da-f]{2})([\da-f]{2})$', re.I).match),
+    (2, re.compile(r'^#([\da-f])([\da-f])([\da-f])$', re.I).match),
+    (1, re.compile(r'^#([\da-f]{2})([\da-f]{2})([\da-f]{2})$', re.I).match),
 )