diff --git a/example/Vulkan/first_triangle.cpp b/example/Vulkan/first_triangle.cpp
index 606dd38e..65b1d537 100644
--- a/example/Vulkan/first_triangle.cpp
+++ b/example/Vulkan/first_triangle.cpp
@@ -98,12 +98,10 @@ private:
 
     bool InitAutoMaterial()
     {
-        MaterialCreateInfo *mci=mtl::CreateVertexColor2D(CoordinateSystem2D::NDC);
+        AutoDelete<MaterialCreateInfo> mci=mtl::CreateVertexColor2D(CoordinateSystem2D::NDC);
 
         material_instance=db->CreateMaterialInstance(mci,&vil_config);
 
-        delete mci;
-
         return material_instance;
     }
 
diff --git a/example/Vulkan/second_triangle.cpp b/example/Vulkan/second_triangle.cpp
index b67b1051..1daeb5d2 100644
--- a/example/Vulkan/second_triangle.cpp
+++ b/example/Vulkan/second_triangle.cpp
@@ -45,18 +45,18 @@ private:
 
     bool InitMaterial()
     {
+        AutoDelete<MaterialCreateInfo> mci;
+
 #ifdef USE_ZERO2ONE_COORD
-        MaterialCreateInfo *mci=mtl::CreateVertexColor2D(CoordinateSystem2D::ZeroToOne);
+        mci=mtl::CreateVertexColor2D(CoordinateSystem2D::ZeroToOne);
 #else
-        MaterialCreateInfo *mci=mtl::CreateVertexColor2D(CoordinateSystem2D::Ortho);
+        mci=mtl::CreateVertexColor2D(CoordinateSystem2D::Ortho);
 #endif//USE_ZERO2ONE_COORD
 
         //material_instance=db->CreateMaterialInstance(OS_TEXT("res/material/VertexColor2D"));
 
         material_instance=db->CreateMaterialInstance(mci);
 
-        delete mci;
-
         if(!material_instance)
             return(false);