diff --git a/graphs_trees/graph_bfs/bfs_solution.ipynb b/graphs_trees/graph_bfs/bfs_solution.ipynb
index 14417ff..94fb659 100644
--- a/graphs_trees/graph_bfs/bfs_solution.ipynb
+++ b/graphs_trees/graph_bfs/bfs_solution.ipynb
@@ -117,7 +117,7 @@
     "    queue = deque()\n",
     "    queue.append(root)\n",
     "    root.visited = True\n",
-    "    while len(queue) > 0:\n",
+    "    while queue:\n",
     "        node = queue.popleft()\n",
     "        visit_func(node.id)\n",
     "        for adjacent_node in node.adjacent:\n",