diff --git a/monkey/common/agent_configuration/agent_sub_configuration_schemas.py b/monkey/common/agent_configuration/agent_sub_configuration_schemas.py
index 3c46cd0fe..a541a8aac 100644
--- a/monkey/common/agent_configuration/agent_sub_configuration_schemas.py
+++ b/monkey/common/agent_configuration/agent_sub_configuration_schemas.py
@@ -94,7 +94,7 @@ class ICMPScanConfigurationSchema(Schema):
 
 class TCPScanConfigurationSchema(Schema):
     timeout = fields.Float()
-    ports = fields.List(fields.Int())
+    ports = fields.List(fields.Int(validate=validate.Range(min=0, max=65535)))
 
     @post_load
     @freeze_lists