diff --git a/com.unity.render-pipelines.high-definition/CHANGELOG.md b/com.unity.render-pipelines.high-definition/CHANGELOG.md
index 6a43baa1257..dd16bf9acf0 100644
--- a/com.unity.render-pipelines.high-definition/CHANGELOG.md
+++ b/com.unity.render-pipelines.high-definition/CHANGELOG.md
@@ -115,6 +115,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed a warning in materialevalulation
 - Fixed an error when building the player.
 - Fixed issue with box light not visible if range is below one and range attenuation is off.
+- Fixed alpha not having TAA applied to it.
 
 ### Changed
 - Preparation pass for RTSSShadows to be supported by render graph.
diff --git a/com.unity.render-pipelines.high-definition/Runtime/PostProcessing/Shaders/TemporalAntiAliasing.shader b/com.unity.render-pipelines.high-definition/Runtime/PostProcessing/Shaders/TemporalAntiAliasing.shader
index 091b0f223e6..f1db75a11be 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/PostProcessing/Shaders/TemporalAntiAliasing.shader
+++ b/com.unity.render-pipelines.high-definition/Runtime/PostProcessing/Shaders/TemporalAntiAliasing.shader
@@ -235,6 +235,10 @@ Shader "Hidden/HDRP/TemporalAA"
 
             color.xyz = ConvertToOutputSpace(finalColor.xyz);
             color.xyz = clamp(color.xyz, 0, CLAMP_MAX);
+#if defined(ENABLE_ALPHA)
+            // Set output alpha to the antialiased alpha.
+            color.w = filteredColor.w;
+#endif
 
             _OutputHistoryTexture[COORD_TEXTURE2D_X(input.positionCS.xy)] = color.CTYPE_SWIZZLE;
             outColor = color.CTYPE_SWIZZLE;