diff --git a/docs/notebooks/UNet.ipynb b/docs/notebooks/UNet.ipynb
index 56094eb28821c2f65412a1144bbbb9ff6598bb20..ee4103017e5837aa0b77d8cb553619099ca991c0 100644
--- a/docs/notebooks/UNet.ipynb
+++ b/docs/notebooks/UNet.ipynb
@@ -459,7 +459,8 @@
     "train_loader, val_loader, test_loader = qim3d.ml.prepare_dataloaders(train_set, \n",
     "                                                                     val_set,\n",
     "                                                                     test_set,\n",
-    "                                                                     batch_size = 1)"
+    "                                                                     batch_size = 1,\n",
+    "                                                                     num_workers = 0)"
    ]
   },
   {