diff --git a/homeassistant/components/nam/config_flow.py b/homeassistant/components/nam/config_flow.py
index 0e98e4f7ef5..00df0e0bf90 100644
--- a/homeassistant/components/nam/config_flow.py
+++ b/homeassistant/components/nam/config_flow.py
@@ -126,7 +126,7 @@ class NAMFlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
         self, discovery_info: zeroconf.ZeroconfServiceInfo
     ) -> FlowResult:
         """Handle zeroconf discovery."""
-        self.host = discovery_info[CONF_HOST]
+        self.host = discovery_info[zeroconf.ATTR_HOST]
         self.context["title_placeholders"] = {"host": self.host}
 
         # Do not probe the device if the host is already configured
diff --git a/tests/components/nam/test_config_flow.py b/tests/components/nam/test_config_flow.py
index 3dbbe416831..5a3e46cedb9 100644
--- a/tests/components/nam/test_config_flow.py
+++ b/tests/components/nam/test_config_flow.py
@@ -6,12 +6,13 @@ from nettigo_air_monitor import ApiError, AuthFailed, CannotGetMac
 import pytest
 
 from homeassistant import data_entry_flow
+from homeassistant.components import zeroconf
 from homeassistant.components.nam.const import DOMAIN
 from homeassistant.config_entries import SOURCE_REAUTH, SOURCE_USER, SOURCE_ZEROCONF
 
 from tests.common import MockConfigEntry
 
-DISCOVERY_INFO = {"host": "10.10.2.3"}
+DISCOVERY_INFO = zeroconf.ZeroconfServiceInfo(host="10.10.2.3")
 VALID_CONFIG = {"host": "10.10.2.3"}
 VALID_AUTH = {"username": "fake_username", "password": "fake_password"}