diff --git a/packages/core/src/shaderlib/common.glsl b/packages/core/src/shaderlib/common.glsl
index bed2784ae..89b82b494 100644
--- a/packages/core/src/shaderlib/common.glsl
+++ b/packages/core/src/shaderlib/common.glsl
@@ -18,6 +18,7 @@ vec4 gammaToLinear(vec4 srgbIn){
 }
 
 vec4 linearToGamma(vec4 linearIn){
+	linearIn = max(linearIn, 0.0);
     return vec4( pow(linearIn.rgb, vec3(1.0 / 2.2)), linearIn.a);
 }
 
diff --git a/packages/core/src/shaderlib/pbr/ibl_frag_define.glsl b/packages/core/src/shaderlib/pbr/ibl_frag_define.glsl
index 270636a40..1ca6da403 100644
--- a/packages/core/src/shaderlib/pbr/ibl_frag_define.glsl
+++ b/packages/core/src/shaderlib/pbr/ibl_frag_define.glsl
@@ -34,9 +34,7 @@ vec3 envBRDFApprox(vec3 specularColor,float roughness, float dotNV ) {
 
     vec2 AB = vec2( -1.04, 1.04 ) * a004 + r.zw;
 
-    // AB may less than 0 at high roughness, ref: https://github.com/galacean/engine/pull/2173
-    return max(specularColor * AB.x + AB.y, 0.0);
-
+    return specularColor * AB.x + AB.y;
 }