diff --git a/openrag/services/workers/parsers/marker_workers.py b/openrag/services/workers/parsers/marker_workers.py
index 255d6fe4f..66f04f296 100644
--- a/openrag/services/workers/parsers/marker_workers.py
+++ b/openrag/services/workers/parsers/marker_workers.py
@@ -25,7 +25,15 @@
 
 
 def _marker_num_gpus(config) -> float:
-    return config.loader.marker_num_gpus if torch.cuda.is_available() else 0
+    """Return the configured Marker GPU request when Ray reports GPU capacity."""
+    requested_gpus = config.loader.marker_num_gpus
+    if requested_gpus <= 0:
+        return 0
+    try:
+        return requested_gpus if ray.cluster_resources().get("GPU", 0) > 0 else 0
+    except Exception as exc:
+        logger.warning("Failed to query Ray cluster GPU resources; falling back to CUDA check", error=str(exc))
+        return requested_gpus if torch.cuda.is_available() else 0
 
 
 @ray.remote
diff --git a/tests/unit/services/workers/parsers/test_marker_workers.py b/tests/unit/services/workers/parsers/test_marker_workers.py
new file mode 100644
index 000000000..7ecba70f4
--- /dev/null
+++ b/tests/unit/services/workers/parsers/test_marker_workers.py
@@ -0,0 +1,18 @@
+from __future__ import annotations
+
+from types import SimpleNamespace
+
+from services.workers.parsers import marker_workers
+
+
+def _config(marker_num_gpus: float = 0.25):
+    """Build the minimal config shape consumed by Marker GPU selection."""
+    return SimpleNamespace(loader=SimpleNamespace(marker_num_gpus=marker_num_gpus))
+
+
+def test_marker_num_gpus_uses_ray_cluster_resources_when_cuda_is_hidden(monkeypatch):
+    """Marker should request GPUs from Ray even when local CUDA is hidden."""
+    monkeypatch.setattr(marker_workers.torch.cuda, "is_available", lambda: False)
+    monkeypatch.setattr(marker_workers.ray, "cluster_resources", lambda: {"GPU": 1.0})
+
+    assert marker_workers._marker_num_gpus(_config()) == 0.25
diff --git a/tests/unit/services/workers/test_dispatcher.py b/tests/unit/services/workers/test_dispatcher.py
index 7da62c7bb..046fd4d19 100644
--- a/tests/unit/services/workers/test_dispatcher.py
+++ b/tests/unit/services/workers/test_dispatcher.py
@@ -254,9 +254,13 @@ async def test_delete_file_cleans_database_before_vector_store() -> None:
     )
 
     call_order = []
-    workspace_repo.remove_file_from_all_workspaces = AsyncMock(side_effect=lambda *a, **k: call_order.append("workspace"))
+    workspace_repo.remove_file_from_all_workspaces = AsyncMock(
+        side_effect=lambda *a, **k: call_order.append("workspace")
+    )
     document_repo.remove_file_from_partition = AsyncMock(side_effect=lambda *a, **k: call_order.append("document"))
-    vector_store.query_ids_by_filter = AsyncMock(return_value=["1", "2"], side_effect=lambda *a, **k: call_order.append("query") or ["1", "2"])
+    vector_store.query_ids_by_filter = AsyncMock(
+        return_value=["1", "2"], side_effect=lambda *a, **k: call_order.append("query") or ["1", "2"]
+    )
     vector_store.delete = AsyncMock(side_effect=lambda *a, **k: call_order.append("delete") or None)
 
     await dispatcher.delete_file("file-1", "tenant-a")