diff --git a/homeassistant/helpers/system_info.py b/homeassistant/helpers/system_info.py
index e137d0f673e..a551c6e3b9e 100644
--- a/homeassistant/helpers/system_info.py
+++ b/homeassistant/helpers/system_info.py
@@ -41,8 +41,11 @@ async def async_get_system_info(hass: HomeAssistant) -> dict[str, Any]:
 
     # Determine installation type on current data
     if info_object["docker"]:
-        if info_object["user"] == "root":
+        if info_object["user"] == "root" and os.path.isfile("/OFFICIAL_IMAGE"):
             info_object["installation_type"] = "Home Assistant Container"
+        else:
+            info_object["installation_type"] = "Unsupported Third Party Container"
+
     elif is_virtual_env():
         info_object["installation_type"] = "Home Assistant Core"
 
diff --git a/tests/helpers/test_system_info.py b/tests/helpers/test_system_info.py
index f4cb70f421a..e4aba5fbb24 100644
--- a/tests/helpers/test_system_info.py
+++ b/tests/helpers/test_system_info.py
@@ -18,15 +18,15 @@ async def test_container_installationtype(hass):
     """Test container installation type."""
     with patch("platform.system", return_value="Linux"), patch(
         "os.path.isfile", return_value=True
-    ):
+    ), patch("homeassistant.helpers.system_info.getuser", return_value="root"):
         info = await hass.helpers.system_info.async_get_system_info()
         assert info["installation_type"] == "Home Assistant Container"
 
     with patch("platform.system", return_value="Linux"), patch(
-        "os.path.isfile", return_value=True
+        "os.path.isfile", side_effect=lambda file: file == "/.dockerenv"
     ), patch("homeassistant.helpers.system_info.getuser", return_value="user"):
         info = await hass.helpers.system_info.async_get_system_info()
-        assert info["installation_type"] == "Unknown"
+        assert info["installation_type"] == "Unsupported Third Party Container"
 
 
 async def test_getuser_keyerror(hass):