diff --git a/src/demo/xray.c b/src/demo/xray.c
index 9fbf2e7d1..aa27bef29 100644
--- a/src/demo/xray.c
+++ b/src/demo/xray.c
@@ -17,9 +17,9 @@ static const char* leg[] = {
 
 static struct ncplane*
 make_slider(struct notcurses* nc, int dimy, int dimx){
-  // 600 frames in the video
+  // 487 frames in the video
   const int len = strlen(leg[0]);
-  const int REPS = 600 / len + dimx / len;
+  const int REPS = 487 / len + dimx / len;
   int y = dimy - sizeof(leg) / sizeof(*leg);
   struct ncplane_options nopts = {
     .y = y,