diff --git a/monkey/infection_monkey/exploit/tools/http_tools.py b/monkey/infection_monkey/exploit/tools/http_tools.py
index 5b73251d9..b27f6cf6f 100644
--- a/monkey/infection_monkey/exploit/tools/http_tools.py
+++ b/monkey/infection_monkey/exploit/tools/http_tools.py
@@ -57,6 +57,6 @@ class HTTPTools(object):
         httpd.start()
         lock.acquire()
         return (
-            "http://%s:%s/%s" % (local_ip, local_port, urllib.parse.quote(host.os["type"].value)),
+            f"http://{local_ip}:{local_port}/{urllib.parse.quote(host.os['type'].value)}",
             httpd,
         )