diff --git a/6.3-advanced-usage-of-recurrent-neural-networks.ipynb b/6.3-advanced-usage-of-recurrent-neural-networks.ipynb
index 5de9767b00..a528b38e4e 100644
--- a/6.3-advanced-usage-of-recurrent-neural-networks.ipynb
+++ b/6.3-advanced-usage-of-recurrent-neural-networks.ipynb
@@ -288,7 +288,7 @@
     "            rows = np.random.randint(\n",
     "                min_index + lookback, max_index, size=batch_size)\n",
     "        else:\n",
-    "            if i + batch_size >= max_index:\n",
+    "            if i + batch_size <= max_index:\n",
     "                i = min_index + lookback\n",
     "            rows = np.arange(i, min(i + batch_size, max_index))\n",
     "            i += len(rows)\n",