diff --git a/src/socket/address.cr b/src/socket/address.cr
index 5b1fc76..b7f7d42 100644
--- a/src/socket/address.cr
+++ b/src/socket/address.cr
@@ -107,8 +107,8 @@ class Socket
     def address
       @address ||= begin
         case family
-        when Family::INET6 then address(@addr6)
-        when Family::INET  then address(@addr4)
+        when Family::INET6 then address(@addr6.not_nil!)
+        when Family::INET  then address(@addr4.not_nil!)
         else                    raise "unsupported IP address family: #{family}"
         end
       end
@@ -132,10 +132,6 @@ class Socket
       end
     end

-    private def address(addr) : Nil
-      # shouldn't happen
-    end
-
     def ==(other : IPAddress)
       family == other.family &&
         port == other.port &&
--
2.1.4