diff --git a/index.html b/index.html
index c173778..c4b643c 100644
--- a/index.html
+++ b/index.html
@@ -2,7 +2,7 @@
 <html>
 <head>
   <meta charset="utf-8">
-  <title>MDN Games: Shaders demo</title>
+  <title>WebGL port of OpenEmulator NTSC shader</title>
   <style>
   </style>
 <style>
diff --git a/screenEmu.js b/screenEmu.js
index d069d89..f2be57d 100644
--- a/screenEmu.js
+++ b/screenEmu.js
@@ -990,7 +990,7 @@ void main(void)
                                   0, 0, this.display.videoSaturation).mul(decoderMatrix);
 
       // Hue
-      const hue = 2 * Math.PI * this.display.videoHue;
+      let hue = 2 * Math.PI * this.display.videoHue;
 
       decoderMatrix = new Matrix3(1, 0, 0,
                                   0, Math.cos(hue), -Math.sin(hue),
@@ -1360,7 +1360,7 @@ void main(void)
         break;
       }
 
-      const shadowMaskDotPitch = this.display.displayShadowMaskDotPitch;
+      let shadowMaskDotPitch = this.display.displayShadowMaskDotPitch;
 
       if (shadowMaskDotPitch <= 0.001)
         shadowMaskDotPitch = 0.001;
