diff --git a/ntsc/shaders/ntsc-rgbyuv.inc b/ntsc/shaders/ntsc-rgbyuv.inc
index ccf8fd3..27fb136 100644
--- a/ntsc/shaders/ntsc-rgbyuv.inc
+++ b/ntsc/shaders/ntsc-rgbyuv.inc
@@ -1,21 +1,20 @@
-mat3 yiq2rgb_mat = mat3(
-   1.0, 1.0, 1.0,
-   0.956, -0.2720, -1.1060,
-   0.6210, -0.6474, 1.7046
-);
+const mat3 yiq2rgb_mat = mat3(
+   1.0, 0.956, 0.6210,
+   1.0, -0.2720, -0.6474,
+   1.0, -1.1060, 1.7046);
 
 vec3 yiq2rgb(vec3 yiq)
 {
-   return (yiq * yiq2rgb_mat);
+   return yiq * yiq2rgb_mat;
 }
 
-mat3 yiq_mat = mat3(
-      0.2989, 0.5959, 0.2115,
-      0.5870, -0.2744, -0.5229,
-      0.1140, -0.3216, 0.3114
+const mat3 yiq_mat = mat3(
+      0.2989, 0.5870, 0.1140,
+      0.5959, -0.2744, -0.3216,
+      0.2115, -0.5229, 0.3114
 );
 
 vec3 rgb2yiq(vec3 col)
 {
-   return (col * yiq_mat);
+   return col * yiq_mat;
 }