diff --git a/rtc_tools/rtc_event_log_visualizer/plot_base.cc b/rtc_tools/rtc_event_log_visualizer/plot_base.cc
index dce601a832..82533e6eb0 100644
--- a/rtc_tools/rtc_event_log_visualizer/plot_base.cc
+++ b/rtc_tools/rtc_event_log_visualizer/plot_base.cc
@@ -127,9 +127,8 @@ void Plot::PrintPythonCode() const {
         // There is a plt.bar function that draws bar plots,
         // but it is *way* too slow to be useful.
         printf(
-            "plt.vlines(x%zu, map(lambda t: min(t,0), y%zu), map(lambda t: "
-            "max(t,0), y%zu), color=colors[%zu], "
-            "label=\'%s\')\n",
+            "plt.vlines(x%zu, [min(t,0) for t in y%zu], [max(t,0) for t in "
+            "y%zu], color=colors[%zu], label=\'%s\')\n",
             i, i, i, i, series_list_[i].label.c_str());
         if (series_list_[i].point_style == PointStyle::kHighlight) {
           printf(