diff --git a/rtc_tools/event_log_visualizer/plot_python.cc b/rtc_tools/event_log_visualizer/plot_python.cc
index bb42556250..2efb1f1ea0 100644
--- a/rtc_tools/event_log_visualizer/plot_python.cc
+++ b/rtc_tools/event_log_visualizer/plot_python.cc
@@ -164,6 +164,7 @@ PythonPlotCollection::~PythonPlotCollection() {}
 
 void PythonPlotCollection::Draw() {
   printf("import matplotlib.pyplot as plt\n");
+  printf("plt.rcParams.update({'figure.max_open_warning': 0})\n");
   printf("import matplotlib.patches as mpatches\n");
   printf("import matplotlib.patheffects as pe\n");
   printf("import colorsys\n");