diff --git a/src/wormhole/test/test_ipaddrs.py b/src/wormhole/test/test_ipaddrs.py
index 9e2cec5e..7534fe05 100644
--- a/src/wormhole/test/test_ipaddrs.py
+++ b/src/wormhole/test/test_ipaddrs.py
@@ -7,7 +7,7 @@
 
 from .. import ipaddrs
 
-DOTTED_QUAD_RE = re.compile("^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$")
+DOTTED_QUAD_RE = re.compile(r"^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$")
 
 MOCK_IPADDR_OUTPUT = """\
 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN \n\
diff --git a/tox.ini b/tox.ini
index f8ac1b6b..4d7a007f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -42,6 +42,6 @@ deps = flake8
 commands = flake8 src/wormhole
 
 [flake8]
-ignore = E741
+ignore = E741,W503,W504
 exclude = .git,__pycache__,docs/source/conf.py,old,build,dist
 max-complexity = 40