diff --git a/cores/esp8266/IPAddress.h b/cores/esp8266/IPAddress.h
index cdd4b2499f..5ba369cc91 100644
--- a/cores/esp8266/IPAddress.h
+++ b/cores/esp8266/IPAddress.h
@@ -141,6 +141,8 @@ class IPAddress: public Printable {
 
         virtual size_t printTo(Print& p) const;
         String toString() const;
+ 
+        void clear();
 
         /*
                 check if input string(arg) is a valid IPV4 address or not.