diff --git a/homeassistant/components/mqtt/config_flow.py b/homeassistant/components/mqtt/config_flow.py
index 6697b17dfdc..0a763e850e5 100644
--- a/homeassistant/components/mqtt/config_flow.py
+++ b/homeassistant/components/mqtt/config_flow.py
@@ -120,7 +120,6 @@ class FlowHandler(config_entries.ConfigFlow, domain=DOMAIN):
                         CONF_PORT: data[CONF_PORT],
                         CONF_USERNAME: data.get(CONF_USERNAME),
                         CONF_PASSWORD: data.get(CONF_PASSWORD),
-                        CONF_PROTOCOL: data.get(CONF_PROTOCOL),
                         CONF_DISCOVERY: DEFAULT_DISCOVERY,
                     },
                 )
diff --git a/tests/components/mqtt/test_config_flow.py b/tests/components/mqtt/test_config_flow.py
index f0e02ad8a3a..565fa7fda53 100644
--- a/tests/components/mqtt/test_config_flow.py
+++ b/tests/components/mqtt/test_config_flow.py
@@ -235,7 +235,8 @@ async def test_hassio_confirm(hass, mock_try_connection_success, mock_finish_set
                 "port": 1883,
                 "username": "mock-user",
                 "password": "mock-pass",
-                "protocol": "3.1.1",
+                "protocol": "3.1.1",  # Set by the addon's discovery, ignored by HA
+                "ssl": False,  # Set by the addon's discovery, ignored by HA
             }
         ),
         context={"source": config_entries.SOURCE_HASSIO},
@@ -255,7 +256,6 @@ async def test_hassio_confirm(hass, mock_try_connection_success, mock_finish_set
         "port": 1883,
         "username": "mock-user",
         "password": "mock-pass",
-        "protocol": "3.1.1",
         "discovery": True,
     }
     # Check we tried the connection