diff --git a/com.unity.render-pipelines.high-definition/CHANGELOG.md b/com.unity.render-pipelines.high-definition/CHANGELOG.md
index 08b3926650f..8ffeef0c4b7 100644
--- a/com.unity.render-pipelines.high-definition/CHANGELOG.md
+++ b/com.unity.render-pipelines.high-definition/CHANGELOG.md
@@ -665,6 +665,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed area light cookie not updated when switch the light type from a spot that had a cookie.
 - Fixed issue with dynamic resolution updating when not in play mode.
 - Fixed issue with Contrast Adaptive Sharpening upsample mode and preview camera.
+- Fix issue causing blocky artifacts when decals affect metallic and are applied on material with specular color workflow.
 
 ### Changed
 - Improve MIP selection for decals on Transparents
diff --git a/com.unity.render-pipelines.high-definition/Runtime/Material/Lit/LitDecalData.hlsl b/com.unity.render-pipelines.high-definition/Runtime/Material/Lit/LitDecalData.hlsl
index 06951a7e204..eff35477336 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Material/Lit/LitDecalData.hlsl
+++ b/com.unity.render-pipelines.high-definition/Runtime/Material/Lit/LitDecalData.hlsl
@@ -16,7 +16,7 @@ void ApplyDecalToSurfaceData(DecalSurfaceData decalSurfaceData, inout SurfaceDat
 #ifdef DECALS_4RT // only smoothness in 3RT mode
 #ifdef _MATERIAL_FEATURE_SPECULAR_COLOR
         float3 decalSpecularColor = ComputeFresnel0((decalSurfaceData.HTileMask & DBUFFERHTILEBIT_DIFFUSE) ? decalSurfaceData.baseColor.xyz : float3(1.0, 1.0, 1.0), decalSurfaceData.mask.x, DEFAULT_SPECULAR_VALUE);
-        surfaceData.specularColor = surfaceData.specularColor * decalSurfaceData.MAOSBlend.x + decalSpecularColor;
+        surfaceData.specularColor = surfaceData.specularColor * decalSurfaceData.MAOSBlend.x + decalSpecularColor * (1.0f - decalSurfaceData.MAOSBlend.x);
 #else
         surfaceData.metallic = surfaceData.metallic * decalSurfaceData.MAOSBlend.x + decalSurfaceData.mask.x;
 #endif