diff --git a/search-4e.ipynb b/search-4e.ipynb
index c7286c88b..73da69119 100644
--- a/search-4e.ipynb
+++ b/search-4e.ipynb
@@ -825,6 +825,7 @@
" def __init__(self, initial, LIFO=False):\n",
" \"\"\"Initialize Frontier with an initial Node.\n",
" If LIFO is True, pop from the end first; otherwise from front first.\"\"\"\n",
+ " super(FrontierQ, self).__init__()\n",
" self.LIFO = LIFO\n",
" self.add(initial)\n",
" \n",
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