diff --git a/src/libguc/src/converter.cpp b/src/libguc/src/converter.cpp
index 2766939..964fb0c 100644
--- a/src/libguc/src/converter.cpp
+++ b/src/libguc/src/converter.cpp
@@ -761,23 +761,23 @@ namespace guc
 
   void Converter::createMaterialBinding(UsdPrim& prim, const std::string& materialName)
   {
-#ifndef NDEBUG
-    if (!TfGetEnvSetting(GUC_DISABLE_PREVIEW_MATERIAL_BINDINGS))
-#endif
+    if (m_params.emitMtlx)
     {
       UsdShadeMaterialBindingAPI::Apply(prim).Bind(
-        UsdShadeMaterial::Get(m_stage, makeUsdPreviewSurfaceMaterialPath(materialName)),
+        UsdShadeMaterial::Get(m_stage, makeMtlxMaterialPath(materialName)),
         UsdShadeTokens->fallbackStrength,
-        UsdShadeTokens->preview
+        UsdShadeTokens->allPurpose
       );
     }
 
-    if (m_params.emitMtlx)
+#ifndef NDEBUG
+    if (!TfGetEnvSetting(GUC_DISABLE_PREVIEW_MATERIAL_BINDINGS))
+#endif
     {
       UsdShadeMaterialBindingAPI::Apply(prim).Bind(
-        UsdShadeMaterial::Get(m_stage, makeMtlxMaterialPath(materialName)),
+        UsdShadeMaterial::Get(m_stage, makeUsdPreviewSurfaceMaterialPath(materialName)),
         UsdShadeTokens->fallbackStrength,
-        UsdShadeTokens->allPurpose
+        m_params.emitMtlx ? UsdShadeTokens->preview : UsdShadeTokens->allPurpose
       );
     }
   }