diff --git a/com.unity.render-pipelines.high-definition/CHANGELOG.md b/com.unity.render-pipelines.high-definition/CHANGELOG.md
index f3184d09782..dbee62c568f 100644
--- a/com.unity.render-pipelines.high-definition/CHANGELOG.md
+++ b/com.unity.render-pipelines.high-definition/CHANGELOG.md
@@ -655,6 +655,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fix issue with fast memory and rendergraph. 
 - Fixed transparent motion vector framesetting not sanitized.
 - Fixed wrong order of post process frame settings.
+- Fixed white flash when enabling SSR or SSGI.
 
 ### Changed
 - Improve MIP selection for decals on Transparents
diff --git a/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/Camera/HDCamera.cs b/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/Camera/HDCamera.cs
index c14e096b4e0..f9252652b5c 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/Camera/HDCamera.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/Camera/HDCamera.cs
@@ -454,6 +454,8 @@ internal void Update(FrameSettings currentFrameSettings, HDRenderPipeline hdrp,
                 {
                     // Reinit the system.
                     colorPyramidHistoryIsValid = false;
+                    // Since we nuke all history we must inform the post process system too.
+                    resetPostProcessingHistory = true;
 
                     HDRenderPipeline.DestroyVolumetricHistoryBuffers(this);