diff --git a/inc/hgl/graph/VKArrayBuffer.h b/inc/hgl/graph/VKArrayBuffer.h
index 47fcef75..c0b2a426 100644
--- a/inc/hgl/graph/VKArrayBuffer.h
+++ b/inc/hgl/graph/VKArrayBuffer.h
@@ -30,10 +30,14 @@ namespace hgl
                 buffer_usage_flags=flags;
 
                 {
-                    const size_t unit_size=sizeof(T);
+                    uint32_t unit_size=sizeof(T);
                     VKMemoryAllocator *ma=new VKMemoryAllocator(device,buffer_usage_flags);
                     MemoryBlock *mb=new MemoryBlock(ma);
 
+                    uint32_t align_size=ma->GetAllocUnitSize()-1;     ///< this value is "min UBO Offset alignment"
+
+                    unit_size=(unit_size+align_size)&(~align_size);
+
                     coll=new Collection(unit_size,mb);
                 }
             }
diff --git a/src/SceneGraph/CMakeLists.txt b/src/SceneGraph/CMakeLists.txt
index 1315873a..73335400 100644
--- a/src/SceneGraph/CMakeLists.txt
+++ b/src/SceneGraph/CMakeLists.txt
@@ -107,11 +107,10 @@ SET(VK_MEMORY_SOURCE    ${SG_INCLUDE_PATH}/VKMemory.h
                         ${SG_INCLUDE_PATH}/VKBuffer.h
                         ${SG_INCLUDE_PATH}/VKVertexAttribBuffer.h
                         ${SG_INCLUDE_PATH}/VKIndexBuffer.h
-#                        ${SG_INCLUDE_PATH}/VKArrayBuffer.h
+                        ${SG_INCLUDE_PATH}/VKArrayBuffer.h
                         Vulkan/VKMemory.cpp
                         Vulkan/VKMemoryAllocator.cpp
                         Vulkan/VKBuffer.cpp
-#                        Vulkan/VKArrayBuffer.cpp
                         )
 
 SET(VK_DEVICE_SOURCE    ${SG_INCLUDE_PATH}/VKDevice.h