diff --git a/gateway/config.py b/gateway/config.py
index 6cd436f82..06a411661 100644
--- a/gateway/config.py
+++ b/gateway/config.py
@@ -478,7 +478,7 @@ def _apply_env_overrides(config: GatewayConfig) -> None:
         config.platforms[Platform.WEB].enabled = True
         config.platforms[Platform.WEB].extra.update({
             "port": int(os.getenv("WEB_UI_PORT", "8765")),
-            "host": os.getenv("WEB_UI_HOST", "127.0.0.1"),
+            "host": os.getenv("WEB_UI_HOST", "") or "127.0.0.1",
             "token": os.getenv("WEB_UI_TOKEN", ""),
         })
 
diff --git a/tests/gateway/test_web.py b/tests/gateway/test_web.py
index 3b4b2809b..85a04941f 100644
--- a/tests/gateway/test_web.py
+++ b/tests/gateway/test_web.py
@@ -81,6 +81,7 @@ class TestConfigEnvOverrides(unittest.TestCase):
     @patch.dict(os.environ, {
         "WEB_UI_ENABLED": "true",
         "WEB_UI_TOKEN": "",
+        "WEB_UI_HOST": "",
     }, clear=False)
     def test_web_defaults(self):
         config = GatewayConfig()