diff --git a/stream-servers/vulkan/VkCommonOperations.cpp b/stream-servers/vulkan/VkCommonOperations.cpp
index e799249..ac151f0 100644
--- a/stream-servers/vulkan/VkCommonOperations.cpp
+++ b/stream-servers/vulkan/VkCommonOperations.cpp
@@ -1968,7 +1968,7 @@
         return false;
     }
 
-    std::size_t bufferCopySize = 0;
+    VkDeviceSize bufferCopySize = 0;
     std::vector<VkBufferImageCopy> bufferImageCopies;
     if (!getFormatTransferInfo(colorBufferInfo->imageCreateInfoShallow.format,
                                colorBufferInfo->imageCreateInfoShallow.extent.width,
@@ -2153,7 +2153,7 @@
         return false;
     }
 
-    std::size_t bufferCopySize = 0;
+    VkDeviceSize bufferCopySize = 0;
     std::vector<VkBufferImageCopy> bufferImageCopies;
     if (!getFormatTransferInfo(colorBufferInfo->imageCreateInfoShallow.format,
                                colorBufferInfo->imageCreateInfoShallow.extent.width,