diff --git a/whois.h b/whois.h
index 205b763..b384152 100644
--- a/whois.h
+++ b/whois.h
@@ -3,7 +3,7 @@
 
 /* String sent to RIPE servers - MUST NOT BE LONGER THAN FIVE CHARACTERS! */
 /* Do *NOT* change it if you don't know what you are doing! */
-#define IDSTRING "Md5.1"
+#define IDSTRING "Md5.2"
 
 #define HIDE_TO_THE_END  -3
 #define HIDE_DISABLED    -2