diff --git a/src/Dhcp.cpp b/src/Dhcp.cpp
index 2bfd584b..24c4bcc7 100644
--- a/src/Dhcp.cpp
+++ b/src/Dhcp.cpp
@@ -26,9 +26,12 @@ int DhcpClass::beginWithDHCP(uint8_t *mac, unsigned long timeout, unsigned long
 void DhcpClass::reset_DHCP_lease()
 {
 	// zero out _dhcpSubnetMask, _dhcpGatewayIp, _dhcpLocalIp, _dhcpDhcpServerIp, _dhcpDnsServerIp
-	memset(_dhcpLocalIp, 0, 20);
+	memset(_dhcpLocalIp, 0, sizeof(_dhcpLocalIp));
+    memset(_dhcpSubnetMask, 0, sizeof(_dhcpSubnetMask));
+    memset(_dhcpGatewayIp, 0, sizeof(_dhcpGatewayIp));
+    memset(_dhcpDhcpServerIp, 0, sizeof(_dhcpDhcpServerIp));
+    memset(_dhcpDnsServerIp, 0, sizeof(_dhcpDnsServerIp));
 }
-
 	//return:0 on error, 1 if request is sent and response is received
 int DhcpClass::request_DHCP_lease()
 {