diff --git a/assets/voxygen/shaders/particle-frag.glsl b/assets/voxygen/shaders/particle-frag.glsl
index 92cebd6e21..3e5433341a 100644
--- a/assets/voxygen/shaders/particle-frag.glsl
+++ b/assets/voxygen/shaders/particle-frag.glsl
@@ -89,7 +89,7 @@ void main() {
             : compute_attenuation_point(f_pos, -view_dir, vec3(0), fluid_alt, /*cam_pos.z <= fluid_alt ? cam_pos.xyz : f_pos*/cam_pos.xyz);
     #endif
 
-    max_light += get_sun_diffuse2(sun_info, moon_info, f_norm, view_dir, f_pos, MU_WATER, cam_attenuation, fluid_alt, k_a, k_d, k_s, alpha, f_norm, 1.0, emitted_light, reflected_light);
+    max_light += get_sun_diffuse2(sun_info, moon_info, f_norm, view_dir, f_pos, mu, cam_attenuation, fluid_alt, k_a, k_d, k_s, alpha, f_norm, 1.0, emitted_light, reflected_light);
 
     max_light += lights_at(f_pos, f_norm, view_dir, mu, cam_attenuation, fluid_alt, k_a, k_d, k_s, alpha, f_norm, 1.0, emitted_light, reflected_light);