diff --git a/sorting_searching/merge_sort/merge_sort_solution.ipynb b/sorting_searching/merge_sort/merge_sort_solution.ipynb
index 3d721a4..93da0ea 100644
--- a/sorting_searching/merge_sort/merge_sort_solution.ipynb
+++ b/sorting_searching/merge_sort/merge_sort_solution.ipynb
@@ -33,7 +33,6 @@
    "source": [
     "## Constraints\n",
     "\n",
-
     "* Is a naiive solution sufficient?\n",
     "    * Yes"
    ]
@@ -87,6 +86,9 @@
    },
    "outputs": [],
    "source": [
+    "from __future__ import division\n",
+    "\n",
+    "\n",
     "def merge(left, right):\n",
     "    l = 0\n",
     "    r = 0\n",
@@ -111,7 +113,7 @@
     "def merge_sort(data):\n",
     "    if len(data) < 2:\n",
     "        return data\n",
-    "    mid = len(data) / 2\n",
+    "    mid = int(len(data) / 2)\n",
     "    left = data[0:mid]\n",
     "    right = data[mid:len(data)]\n",
     "    left = merge_sort(left)\n",