diff --git a/introduction_to_bayes_smc.ipynb b/introduction_to_bayes_smc.ipynb
index c87e14d..314d292 100644
--- a/introduction_to_bayes_smc.ipynb
+++ b/introduction_to_bayes_smc.ipynb
@@ -296,6 +296,9 @@
     "    def likelihood(self, outcomes, modelparams, expparams):\n",
     "        # Finally, we calculate the likelihood function\n",
     "        # Again, call some necessary internal functions.\n",
+    "        expparams = np.asarray(expparams,dtype=self.expparams_dtype)\n",
+    "        if len(expparams.shape) == 0:\n",
+    "             expparams = expparams.reshape(-1)\n",
     "        super(CoinFlipsModel,self).likelihood(outcomes, modelparams, expparams)\n",
     "        \n",
     "        # The tensor storing the values of the likelihood has the following expected shape.\n",