diff --git a/examples/gaussian_likelihood.ipynb b/examples/gaussian_likelihood.ipynb
index f825dc0..9a7170a 100644
--- a/examples/gaussian_likelihood.ipynb
+++ b/examples/gaussian_likelihood.ipynb
@@ -74,7 +74,7 @@
     "        return ll+lp, ll_grad+lp_grad\n",
     "    \n",
     "    def lnpost(self, x):\n",
-    "        return lnpost_grad(x)[0]\n",
+    "        return self.lnpost_grad(x)[0]\n",
     "    \n",
     "    def hessian(self, x):\n",
     "        return -np.eye(len(x))"
diff --git a/examples/simple.ipynb b/examples/simple.ipynb
index 983e2aa..2603d7d 100644
--- a/examples/simple.ipynb
+++ b/examples/simple.ipynb
@@ -23,7 +23,6 @@
     "import numpy as np\n",
     "import matplotlib.pylab as plt\n",
     "import corner\n",
-    "import numpy as np\n",
     "import glob\n",
     "from PTMCMCSampler import PTMCMCSampler\n",
     "\n",