diff --git a/tiramisu/option/ipoption.py b/tiramisu/option/ipoption.py
index cde3283..0ccdc20 100644
--- a/tiramisu/option/ipoption.py
+++ b/tiramisu/option/ipoption.py
@@ -62,7 +62,9 @@ class IPOption(StrOption):
 
     def _validate_ip(self, value):
         try:
-            ip_address(value)
+            new_value = str(ip_address(value))
+            if value != new_value:
+                raise ValueError(f'should be {new_value}')
         except ValueError:
             raise ValueError()