diff --git a/src/psrdnoise2D.glsl b/src/psrdnoise2D.glsl
index 9263b42..30f3b8d 100644
--- a/src/psrdnoise2D.glsl
+++ b/src/psrdnoise2D.glsl
@@ -74,7 +74,7 @@ vec3 mod289(vec3 x) {
 
 // Permutation polynomial (ring size 289 = 17*17)
 vec3 permute(vec3 x) {
-  return mod289(((x*34.0)+6.0)*x);
+  return mod289(((x*34.0)+10.0)*x);
 }
 
 // Hashed 2-D gradients with an extra rotation.