diff --git a/tools_matplotlib.ipynb b/tools_matplotlib.ipynb
index 949f5c2..0fd7513 100644
--- a/tools_matplotlib.ipynb
+++ b/tools_matplotlib.ipynb
@@ -706,7 +706,7 @@
     "ax = plt.subplot(133)\n",
     "plt.plot(x, x**3)\n",
     "plt.minorticks_on()\n",
-    "ax.tick_params(axis='x', which='minor', bottom='off')\n",
+    "ax.tick_params(axis='x', which='minor', bottom=False)\n",
     "ax.xaxis.set_ticks([-2, 0, 1, 2])\n",
     "ax.yaxis.set_ticks(np.arange(-5, 5, 1))\n",
     "ax.yaxis.set_ticklabels([\"min\", -4, -3, -2, -1, 0, 1, 2, 3, \"max\"])\n",