diff --git a/notebooks/wp4/clima_and_bias_cordex_cmip6_regionalised.ipynb b/notebooks/wp4/clima_and_bias_cordex_cmip6_regionalised.ipynb
index 7cc92df..bf3df05 100644
--- a/notebooks/wp4/clima_and_bias_cordex_cmip6_regionalised.ipynb
+++ b/notebooks/wp4/clima_and_bias_cordex_cmip6_regionalised.ipynb
@@ -391,7 +391,7 @@
     ")\n",
     "\n",
     "with xr.set_options(keep_attrs=True):\n",
-    "    ds = ds_timeseries.mean(\"year\")\n",
+    "    ds = ds_timeseries.mean(\"year\").compute()\n",
     "    ds_bias = ds.drop_sel(model=\"ERA5\") - ds.sel(model=\"ERA5\")\n",
     "for da in ds_bias.data_vars.values():\n",
     "    da.attrs[\"long_name\"] += \" Bias\""