diff --git a/docs/examples/notebooks/pytorch_tests_onoff.ipynb b/docs/examples/notebooks/pytorch_tests_onoff.ipynb
index b4c0780a46..b1830d14ad 100644
--- a/docs/examples/notebooks/pytorch_tests_onoff.ipynb
+++ b/docs/examples/notebooks/pytorch_tests_onoff.ipynb
@@ -35,7 +35,7 @@
     "            self.auxdata.append(bkg_over_bsq)\n",
     "\n",
     "    def alphas(self, pars):\n",
-    "        return np.product([pars, self.bkg_over_db_squared], axis=0)\n",
+    "        return np.prod([pars, self.bkg_over_db_squared], axis=0)\n",
     "\n",
     "    def logpdf(self, a, alpha):\n",
     "        return _log_poisson_impl(a, alpha)\n",