diff --git a/source/MaterialXRender/LightHandler.h b/source/MaterialXRender/LightHandler.h
index 00b9bee8d1..a080c72081 100644
--- a/source/MaterialXRender/LightHandler.h
+++ b/source/MaterialXRender/LightHandler.h
@@ -37,6 +37,7 @@ class MX_RENDER_API LightHandler
         _lightTransform(Matrix44::IDENTITY),
         _directLighting(true),
         _indirectLighting(true),
+        _usePrefilteredMap(false),
         _envSampleCount(DEFAULT_ENV_SAMPLE_COUNT),
         _refractionTwoSided(false)
     {