diff --git a/src/main.py b/src/main.py
index 01f8d10..2b4063e 100644
--- a/src/main.py
+++ b/src/main.py
@@ -12,7 +12,8 @@ DDNS_ZONE = os.getenv('DDNS_ZONE')
 
 
 def validIP(ipString):
-    ipRegex = '^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$'
+    ipRegex = r'^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}' \
+              r'([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$'
     return bool(re.search(ipRegex, str(ipString)))