diff --git a/source/MaterialXGenShader/HwShaderGenerator.h b/source/MaterialXGenShader/HwShaderGenerator.h
index fb5b28f11b..bdd1e33a5c 100644
--- a/source/MaterialXGenShader/HwShaderGenerator.h
+++ b/source/MaterialXGenShader/HwShaderGenerator.h
@@ -127,8 +127,8 @@ extern MX_GENSHADER_API const string T_ENV_RADIANCE;
 extern MX_GENSHADER_API const string T_ENV_RADIANCE_MIPS;
 extern MX_GENSHADER_API const string T_ENV_RADIANCE_SAMPLES;
 extern MX_GENSHADER_API const string T_ENV_IRRADIANCE;
-extern MX_GENSHADER_API const string T_ENV_PREFILTER_MIP;
 extern MX_GENSHADER_API const string T_ENV_LIGHT_INTENSITY;
+extern MX_GENSHADER_API const string T_ENV_PREFILTER_MIP;
 extern MX_GENSHADER_API const string T_REFRACTION_TWO_SIDED;
 extern MX_GENSHADER_API const string T_ALBEDO_TABLE;
 extern MX_GENSHADER_API const string T_ALBEDO_TABLE_SIZE;
@@ -185,8 +185,8 @@ extern MX_GENSHADER_API const string ENV_RADIANCE;
 extern MX_GENSHADER_API const string ENV_RADIANCE_MIPS;
 extern MX_GENSHADER_API const string ENV_RADIANCE_SAMPLES;
 extern MX_GENSHADER_API const string ENV_IRRADIANCE;
-extern MX_GENSHADER_API const string ENV_PREFILTER_MIP;
 extern MX_GENSHADER_API const string ENV_LIGHT_INTENSITY;
+extern MX_GENSHADER_API const string ENV_PREFILTER_MIP;
 extern MX_GENSHADER_API const string REFRACTION_TWO_SIDED;
 extern MX_GENSHADER_API const string ALBEDO_TABLE;
 extern MX_GENSHADER_API const string ALBEDO_TABLE_SIZE;