diff --git a/tests/benchmarking/plot_benchmark.py b/tests/benchmarking/plot_benchmark.py
index 251a1b4a..eeeb6a8b 100644
--- a/tests/benchmarking/plot_benchmark.py
+++ b/tests/benchmarking/plot_benchmark.py
@@ -154,7 +154,6 @@ ax.set_ylim(bottom=1, top=ax.get_ylim()[1] * 1.1)
 # Subplot of simulation size vs cells/sec #
 ###########################################
 ax = plt.subplot(gs[0, 2])
-cells = np.array([100, 150, 200, 300])
 ax.plot(cells, cpucellspersec / 1e6, color=colors[0], marker='.', ms=10, lw=2, label=cpuID)
 
 if gpuIDs: