diff --git a/test/fullscreen.cxx b/test/fullscreen.cxx
index 0b2ce0e80..b3ede25bc 100644
--- a/test/fullscreen.cxx
+++ b/test/fullscreen.cxx
@@ -240,8 +240,10 @@ void update_screeninfo(Fl_Widget *b, void *p) {
     browser->add(line);
     for (int n = 0; n < Fl::screen_count(); n++) {
 	int x, y, w, h;
+        float dpih, dpiv;
 	Fl::screen_xywh(x, y, w, h, n);
-	sprintf(line, "Screen %d: %dx%d@%d,%d", n, w, h, x, y);
+        Fl::screen_dpi(dpih, dpiv, n);
+        sprintf(line, "Screen %d: %dx%d@%d,%d DPI:%.1fx%.1f", n, w, h, x, y, dpih, dpiv);
 	browser->add(line);
 	Fl::screen_work_area(x, y, w, h, n);
 	sprintf(line, "Work area %d: %dx%d@%d,%d", n, w, h, x, y);