diff --git a/lib/ipv4_validator.rb b/lib/ipv4_validator.rb
index 67e42ca..a619424 100644
--- a/lib/ipv4_validator.rb
+++ b/lib/ipv4_validator.rb
@@ -1,19 +1,20 @@
 require 'ipaddr'
 require 'socket'
 
 class Ipv4Validator < ActiveModel::EachValidator
   # Returns true if addr is a valid IPv4 address.
-  def valid_v4?(addr)
+  def self.valid?(addr)
     return false if addr['/'] # IPAddr accepts addr/mask format
     IPAddr.new(addr, Socket::AF_INET)
     true
   rescue IPAddr::AddressFamilyError, IPAddr::InvalidAddressError
     false
   end
 
   # Add an attribute error if this is not a valid IPv4 address.
   def validate_each(record, attribute, value)
-    return if valid_v4?(value)
+    return if Ipv4Validator.valid?(value)
+
     record.errors[attribute] << 'is not a valid IPv4 address'
   end
 end
diff --git a/lib/ipv6_validator.rb b/lib/ipv6_validator.rb
index cdd1876..e6a67c6 100644
--- a/lib/ipv6_validator.rb
+++ b/lib/ipv6_validator.rb
@@ -1,22 +1,22 @@
 require 'ipaddr'
 require 'socket'
 
 class Ipv6Validator < ActiveModel::EachValidator
   # Returns true if addr is valid IPv6 address.
-  def valid_v6?(addr)
+  def self.valid?(addr)
     return false if addr['/'] # IPAddr accepts addr/mask format
     return false if addr['[']
     return false if addr[']']
     IPAddr.new(addr, Socket::AF_INET6)
     true
   rescue IPAddr::AddressFamilyError, IPAddr::InvalidAddressError
     false
   end
 
   # Add an attribute error if this is not a valid IPv4 address.
   def validate_each(record, attribute, value)
-    return if valid_v6?(value)
+    return if Ipv6Validator.valid?(value)
 
     record.errors[attribute] << 'is not a valid IPv6 address'
   end
 end