diff --git a/homeassistant/components/hassio/discovery.py b/homeassistant/components/hassio/discovery.py
index 6181fe4624c..b51b8e5a8f2 100644
--- a/homeassistant/components/hassio/discovery.py
+++ b/homeassistant/components/hassio/discovery.py
@@ -131,11 +131,11 @@ class HassIODiscovery(HomeAssistantView):
                 config=data.config,
                 name=addon_info.name,
                 slug=data.addon,
-                uuid=str(data.uuid),
+                uuid=data.uuid.hex,
             ),
             discovery_key=discovery_flow.DiscoveryKey(
                 domain=DOMAIN,
-                key=str(data.uuid),
+                key=data.uuid.hex,
                 version=1,
             ),
         )
diff --git a/tests/components/hassio/test_discovery.py b/tests/components/hassio/test_discovery.py
index bb3a101d1f9..ba6338f84e2 100644
--- a/tests/components/hassio/test_discovery.py
+++ b/tests/components/hassio/test_discovery.py
@@ -91,7 +91,7 @@ async def test_hassio_discovery_startup(
             },
             name="Mosquitto Test",
             slug="mosquitto",
-            uuid=str(uuid),
+            uuid=uuid.hex,
         )
     )
 
@@ -153,7 +153,7 @@ async def test_hassio_discovery_startup_done(
                 },
                 name="Mosquitto Test",
                 slug="mosquitto",
-                uuid=str(uuid),
+                uuid=uuid.hex,
             )
         )
 
@@ -203,7 +203,7 @@ async def test_hassio_discovery_webhook(
             },
             name="Mosquitto Test",
             slug="mosquitto",
-            uuid=str(uuid),
+            uuid=uuid.hex,
         )
     )
 
@@ -286,7 +286,7 @@ async def test_hassio_rediscover(
     )
 
     expected_context = {
-        "discovery_key": DiscoveryKey(domain="hassio", key=str(uuid), version=1),
+        "discovery_key": DiscoveryKey(domain="hassio", key=uuid.hex, version=1),
         "source": config_entries.SOURCE_HASSIO,
     }