diff --git a/com.unity.render-pipelines.high-definition/CHANGELOG.md b/com.unity.render-pipelines.high-definition/CHANGELOG.md
index b3253f7174e..fc19bcb2d6f 100644
--- a/com.unity.render-pipelines.high-definition/CHANGELOG.md
+++ b/com.unity.render-pipelines.high-definition/CHANGELOG.md
@@ -213,6 +213,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - UI for Frame Settings has been updated: default values in the HDRP Settings and Custom Frame Settings are always editable
 - Updated Light's shadow layer name in Editor.
 - Increased path tracing max samples from 4K to 16K (case 1327729).
+- Film grain does not affect the alpha channel.
 
 ## [11.0.0] - 2020-10-21
 
diff --git a/com.unity.render-pipelines.high-definition/Runtime/PostProcessing/Shaders/FinalPass.shader b/com.unity.render-pipelines.high-definition/Runtime/PostProcessing/Shaders/FinalPass.shader
index b1fc0df495b..6aefe9c642c 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/PostProcessing/Shaders/FinalPass.shader
+++ b/com.unity.render-pipelines.high-definition/Runtime/PostProcessing/Shaders/FinalPass.shader
@@ -124,7 +124,7 @@ Shader "Hidden/HDRP/FinalPass"
                 float lum = 1.0 - sqrt(Luminance(outColor));
                 lum = lerp(1.0, lum, _GrainParams.y);
 
-                outColor += outColor * grain * _GrainParams.x * lum;
+                outColor.xyz += outColor.xyz * grain * _GrainParams.x * lum;
             }
             #endif