diff --git a/homeassistant/components/broadlink/config_flow.py b/homeassistant/components/broadlink/config_flow.py
index b8999fcd5f5..caf5c0eaaa9 100644
--- a/homeassistant/components/broadlink/config_flow.py
+++ b/homeassistant/components/broadlink/config_flow.py
@@ -23,7 +23,7 @@ from .const import (  # pylint: disable=unused-import
     DOMAIN,
     DOMAINS_AND_TYPES,
 )
-from .helpers import format_mac, mac_address
+from .helpers import format_mac
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -63,9 +63,8 @@ class BroadlinkFlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
     async def async_step_dhcp(self, dhcp_discovery):
         """Handle dhcp discovery."""
         host = dhcp_discovery[IP_ADDRESS]
-        await self.async_set_unique_id(
-            format_mac(mac_address(dhcp_discovery[MAC_ADDRESS]))
-        )
+        unique_id = dhcp_discovery[MAC_ADDRESS].lower().replace(":", "")
+        await self.async_set_unique_id(unique_id)
         self._abort_if_unique_id_configured(updates={CONF_HOST: host})
         try:
             hello = partial(blk.discover, discover_ip_address=host)
diff --git a/tests/components/broadlink/test_config_flow.py b/tests/components/broadlink/test_config_flow.py
index 6291c5d258a..503db632cf5 100644
--- a/tests/components/broadlink/test_config_flow.py
+++ b/tests/components/broadlink/test_config_flow.py
@@ -9,6 +9,7 @@ import pytest
 from homeassistant import config_entries, setup
 from homeassistant.components.broadlink.const import DOMAIN
 from homeassistant.components.dhcp import HOSTNAME, IP_ADDRESS, MAC_ADDRESS
+from homeassistant.helpers import device_registry
 
 from . import get_device
 
@@ -837,7 +838,7 @@ async def test_dhcp_can_finish(hass):
             data={
                 HOSTNAME: "broadlink",
                 IP_ADDRESS: "1.2.3.4",
-                MAC_ADDRESS: "aa:bb:cc:dd:ee:ff",
+                MAC_ADDRESS: device_registry.format_mac(device.mac),
             },
         )
         await hass.async_block_till_done()
@@ -871,7 +872,7 @@ async def test_dhcp_fails_to_connect(hass):
             data={
                 HOSTNAME: "broadlink",
                 IP_ADDRESS: "1.2.3.4",
-                MAC_ADDRESS: "aa:bb:cc:dd:ee:ff",
+                MAC_ADDRESS: "34:ea:34:b4:3b:5a",
             },
         )
         await hass.async_block_till_done()
@@ -890,7 +891,7 @@ async def test_dhcp_unreachable(hass):
             data={
                 HOSTNAME: "broadlink",
                 IP_ADDRESS: "1.2.3.4",
-                MAC_ADDRESS: "aa:bb:cc:dd:ee:ff",
+                MAC_ADDRESS: "34:ea:34:b4:3b:5a",
             },
         )
         await hass.async_block_till_done()
@@ -909,7 +910,7 @@ async def test_dhcp_connect_einval(hass):
             data={
                 HOSTNAME: "broadlink",
                 IP_ADDRESS: "1.2.3.4",
-                MAC_ADDRESS: "aa:bb:cc:dd:ee:ff",
+                MAC_ADDRESS: "34:ea:34:b4:3b:5a",
             },
         )
         await hass.async_block_till_done()
@@ -928,7 +929,7 @@ async def test_dhcp_connect_unknown_error(hass):
             data={
                 HOSTNAME: "broadlink",
                 IP_ADDRESS: "1.2.3.4",
-                MAC_ADDRESS: "aa:bb:cc:dd:ee:ff",
+                MAC_ADDRESS: "34:ea:34:b4:3b:5a",
             },
         )
         await hass.async_block_till_done()
@@ -953,10 +954,37 @@ async def test_dhcp_already_exists(hass):
             data={
                 HOSTNAME: "broadlink",
                 IP_ADDRESS: "1.2.3.4",
-                MAC_ADDRESS: "aa:bb:cc:dd:ee:ff",
+                MAC_ADDRESS: "34:ea:34:b4:3b:5a",
             },
         )
         await hass.async_block_till_done()
 
     assert result["type"] == "abort"
     assert result["reason"] == "already_configured"
+
+
+async def test_dhcp_updates_host(hass):
+    """Test DHCP updates host."""
+    await setup.async_setup_component(hass, "persistent_notification", {})
+
+    device = get_device("Living Room")
+    device.host = "1.2.3.4"
+    mock_entry = device.get_mock_entry()
+    mock_entry.add_to_hass(hass)
+    mock_api = device.get_mock_api()
+
+    with patch(DEVICE_DISCOVERY, return_value=[mock_api]):
+        result = await hass.config_entries.flow.async_init(
+            DOMAIN,
+            context={"source": "dhcp"},
+            data={
+                HOSTNAME: "broadlink",
+                IP_ADDRESS: "4.5.6.7",
+                MAC_ADDRESS: "34:ea:34:b4:3b:5a",
+            },
+        )
+        await hass.async_block_till_done()
+
+    assert result["type"] == "abort"
+    assert result["reason"] == "already_configured"
+    assert mock_entry.data["host"] == "4.5.6.7"