diff --git a/homeassistant/components/hassio/discovery.py b/homeassistant/components/hassio/discovery.py
index 802f2f56b77aea..8166b0f2c7ef59 100644
--- a/homeassistant/components/hassio/discovery.py
+++ b/homeassistant/components/hassio/discovery.py
@@ -130,11 +130,11 @@ async def async_process_new(self, data: Discovery) -> None:
                 config=data.config,
                 name=addon_info.name,
                 slug=data.addon,
-                uuid=data.uuid,
+                uuid=str(data.uuid),
             ),
             discovery_key=discovery_flow.DiscoveryKey(
                 domain=DOMAIN,
-                key=data.uuid,
+                key=str(data.uuid),
                 version=1,
             ),
         )
diff --git a/tests/components/hassio/test_discovery.py b/tests/components/hassio/test_discovery.py
index df84fbd6ec9216..09bcc251e6f506 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=uuid,
+            uuid=str(uuid),
         )
     )
 
@@ -153,7 +153,7 @@ async def test_hassio_discovery_startup_done(
                 },
                 name="Mosquitto Test",
                 slug="mosquitto",
-                uuid=uuid,
+                uuid=str(uuid),
             )
         )
 
@@ -203,7 +203,7 @@ async def test_hassio_discovery_webhook(
             },
             name="Mosquitto Test",
             slug="mosquitto",
-            uuid=uuid,
+            uuid=str(uuid),
         )
     )
 
@@ -283,7 +283,7 @@ async def test_hassio_rediscover(
     )
 
     expected_context = {
-        "discovery_key": DiscoveryKey(domain="hassio", key=uuid, version=1),
+        "discovery_key": DiscoveryKey(domain="hassio", key=str(uuid), version=1),
         "source": config_entries.SOURCE_HASSIO,
     }