diff --git a/ntp.h b/ntp.h
index e43ca8c..8072c14 100644
--- a/ntp.h
+++ b/ntp.h
@@ -186,7 +186,8 @@ bool NTPClient::forceUpdate() {
   // this is NTP time (seconds since Jan 1 1900):
   unsigned long secsSince1900 = highWord << 16 | lowWord;
 
-  random16_set_seed(secsSince1900 & 0xFFFF);
+  random16_add_entropy(this->_packetBuffer[44]<<8 | this->_packetBuffer[45]);
+  random16_add_entropy(this->_packetBuffer[46]<<8 | this->_packetBuffer[47]);
 
   this->_currentEpoc = secsSince1900 - SEVENZYYEARS;