diff --git a/src/vllm_tgis_adapter/__main__.py b/src/vllm_tgis_adapter/__main__.py
index b43d924f..f8dab362 100644
--- a/src/vllm_tgis_adapter/__main__.py
+++ b/src/vllm_tgis_adapter/__main__.py
@@ -75,11 +75,13 @@
 
 router = APIRouter()
 
-# Add prometheus asgi middleware to route /metrics requests
-route = Mount("/metrics", make_asgi_app())
-# Workaround for 307 Redirect for /metrics
-route.path_regex = re.compile("^/metrics(?P<path>.*)$")
-router.routes.append(route)
+
+def mount_metrics(app: fastapi.FastAPI) -> None:
+    # Add prometheus asgi middleware to route /metrics requests
+    metrics_route = Mount("/metrics", make_asgi_app())
+    # Workaround for 307 Redirect for /metrics
+    metrics_route.path_regex = re.compile("^/metrics(?P<path>.*)$")
+    app.routes.append(metrics_route)
 
 
 @router.get("/health")
@@ -188,6 +190,8 @@ async def _force_log():  # noqa: ANN202
     app.include_router(router)
     app.root_path = args.root_path
 
+    mount_metrics(app)
+
     app.add_middleware(
         CORSMiddleware,
         allow_origins=args.allowed_origins,
diff --git a/tests/test_http_server.py b/tests/test_http_server.py
index 01bb1370..a664aef5 100644
--- a/tests/test_http_server.py
+++ b/tests/test_http_server.py
@@ -27,3 +27,8 @@ def test_completions(http_server_url, _http_server):
     generated_text = completion["choices"][0]["text"]
 
     assert generated_text
+
+
+def test_metrics(http_server_url, _http_server):
+    response = requests.get(f"{http_server_url}/metrics")
+    response.raise_for_status()