diff --git a/wtformsparsleyjs/core.py b/wtformsparsleyjs/core.py
index 4f6734e..20ba6cc 100644
--- a/wtformsparsleyjs/core.py
+++ b/wtformsparsleyjs/core.py
@@ -70,7 +70,7 @@ def _equal_to_kwargs(kwargs, vali):
 def _ip_address_kwargs(kwargs):
     # Regexp from http://stackoverflow.com/a/4460645
     kwargs[u'data-regexp'] =\
-        r'^\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?).' \
+        r'^\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.' \
         r'(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.' \
         r'(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.' \
         r'(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b$'