diff --git a/src/Fl_Chart.cxx b/src/Fl_Chart.cxx
index fad325f48..9d183c826 100644
--- a/src/Fl_Chart.cxx
+++ b/src/Fl_Chart.cxx
@@ -318,6 +318,7 @@ Fl_Chart::~Fl_Chart() {
  */
 void Fl_Chart::clear() {
   numb = 0;
+  min = max = 0;
   redraw();
 }