diff --git a/src/primaite/simulator/system/services/ntp/ntp_client.py b/src/primaite/simulator/system/services/ntp/ntp_client.py
index ddd794ae..43d1d783 100644
--- a/src/primaite/simulator/system/services/ntp/ntp_client.py
+++ b/src/primaite/simulator/system/services/ntp/ntp_client.py
@@ -21,7 +21,7 @@ class NTPClient(Service):
     def __init__(self, **kwargs):
         kwargs["name"] = "NTPClient"
         kwargs["port"] = Port.NTP
-        kwargs["protocol"] = IPProtocol.TCP
+        kwargs["protocol"] = IPProtocol.UDP
         super().__init__(**kwargs)
         self.start()
 
diff --git a/src/primaite/simulator/system/services/ntp/ntp_server.py b/src/primaite/simulator/system/services/ntp/ntp_server.py
index 3987fa2c..3ae80936 100644
--- a/src/primaite/simulator/system/services/ntp/ntp_server.py
+++ b/src/primaite/simulator/system/services/ntp/ntp_server.py
@@ -16,7 +16,7 @@ class NTPServer(Service):
     def __init__(self, **kwargs):
         kwargs["name"] = "NTPServer"
         kwargs["port"] = Port.NTP
-        kwargs["protocol"] = IPProtocol.TCP
+        kwargs["protocol"] = IPProtocol.UDP
         super().__init__(**kwargs)
         self.start()