diff --git a/monkey/infection_monkey/model/host.py b/monkey/infection_monkey/model/host.py
index 892004eb3..4331bcf7e 100644
--- a/monkey/infection_monkey/model/host.py
+++ b/monkey/infection_monkey/model/host.py
@@ -1,5 +1,5 @@
 class VictimHost(object):
-    def __init__(self, ip_addr, domain_name=""):
+    def __init__(self, ip_addr: str, domain_name: str = ""):
         self.ip_addr = ip_addr
         self.domain_name = str(domain_name)
         self.os = {}