diff --git a/ssh_known_dupes b/ssh_known_dupes
index 6ad959f..5e2b905 100755
--- a/ssh_known_dupes
+++ b/ssh_known_dupes
@@ -13,7 +13,7 @@ hostnames_per_key = defaultdict(list)
 
 with open(os.path.expanduser('~/.ssh/known_hosts')) as f:
     for line in f:
-        m = re.match('(\S+)\s+(\S+\s+\S+)(.*)?', line)
+        m = re.match(r'(\S+)\s+(\S+\s+\S+)(.*)?', line)
         if m:
             (hostname, key, cruft) = m.groups()
             hostnames_per_key[key].append(hostname)