diff --git a/examples/particle_simulation_with_camp.ipynb b/examples/particle_simulation_with_camp.ipynb
index fa1a560e..077fe9f6 100644
--- a/examples/particle_simulation_with_camp.ipynb
+++ b/examples/particle_simulation_with_camp.ipynb
@@ -3065,7 +3065,7 @@
     "plt.plot(OUTPUT['elapsed_time'], OUTPUT['total_mass_conc'], \"b\", label=\"mass conc\")\n",
     "plt.ylabel(\"Mass concentration (kg m$^{-3}$)\", color='b')\n",
     "plt.xlabel(\"Time (s)\")\n",
-    "n_yticks = 5\n",
+    "n_ticks = 5\n",
     "set_tickmarks(plt.gca(), n_ticks)\n",
     "plt.twinx()\n",
     "plt.plot(OUTPUT['elapsed_time'], OUTPUT['total_num_conc'], \"g\", label=\"num conc\")\n",