diff --git a/packages/core/src/shaderlib/pbr/ibl_diffuse_frag.glsl b/packages/core/src/shaderlib/pbr/ibl_diffuse_frag.glsl
index 00fc46f0b4..4d98c2bc5d 100644
--- a/packages/core/src/shaderlib/pbr/ibl_diffuse_frag.glsl
+++ b/packages/core/src/shaderlib/pbr/ibl_diffuse_frag.glsl
@@ -4,6 +4,10 @@
    vec3 irradiance = u_envMapLight.diffuse * u_envMapLight.diffuseIntensity;
 #endif
 
+#ifndef PHYSICALLY_CORRECT_LIGHTS
+   irradiance *= PI;
+#endif
+
 RE_IndirectDiffuse_Physical( irradiance, geometry, material, reflectedLight );