diff --git a/files/shaders/parallax.glsl b/files/shaders/parallax.glsl
index 52ea0d2cc..097a59ed1 100644
--- a/files/shaders/parallax.glsl
+++ b/files/shaders/parallax.glsl
@@ -1,8 +1,8 @@
 #define PARALLAX_SCALE 0.04
 #define PARALLAX_BIAS -0.02
 
-vec2 getParallaxOffset(vec3 eyeDir, mat3 tbn, float height)
+vec2 getParallaxOffset(vec3 eyeDir, mat3 tbnTranspose, float height)
 {
-    vec3 TSeyeDir = normalize((vec4(normalize(tbn * eyeDir),0)).xyz);
+    vec3 TSeyeDir = normalize(eyeDir * tbnTranspose);
     return TSeyeDir.xy * ( height * PARALLAX_SCALE + PARALLAX_BIAS );
 }