diff --git a/index.html b/index.html
index adc6550..b2606f3 100644
--- a/index.html
+++ b/index.html
@@ -616,8 +616,8 @@ function drawSpectrum() {
     else { vuPeakR *= 0.990; }
     drawVuRow(0, levelL);
     drawVuRow(gap + rowH, levelR);
-    const piL = Math.round(vuPeakL * segCount);
-    const piR = Math.round(vuPeakR * segCount);
+    const piL = Math.min(segCount - 1, Math.round(vuPeakL * segCount));
+    const piR = Math.min(segCount - 1, Math.round(vuPeakR * segCount));
     if (vuPeakL > 0.05) {
       vuctx.fillStyle = '#e98989';
       vuctx.fillRect(segLeft + piL * (segW + segG), 0, segW, rowH);