diff --git a/examples/vulkan_example/imgui_impl_glfw_vulkan.cpp b/examples/vulkan_example/imgui_impl_glfw_vulkan.cpp
index b9e6d78f2..080d57d3e 100644
--- a/examples/vulkan_example/imgui_impl_glfw_vulkan.cpp
+++ b/examples/vulkan_example/imgui_impl_glfw_vulkan.cpp
@@ -36,7 +36,7 @@ static VkDescriptorPool       g_DescriptorPool = VK_NULL_HANDLE;
 static void (*g_CheckVkResult)(VkResult err) = NULL;
 
 static VkCommandBuffer        g_CommandBuffer = VK_NULL_HANDLE;
-static size_t                 g_BufferMemoryAlignment = 256;
+static VkDeviceSize           g_BufferMemoryAlignment = 256;
 static VkPipelineCreateFlags  g_PipelineCreateFlags = 0;
 static int                    g_FrameIndex = 0;
 
@@ -52,8 +52,8 @@ static VkImageView            g_FontView = VK_NULL_HANDLE;
 
 static VkDeviceMemory         g_VertexBufferMemory[IMGUI_VK_QUEUED_FRAMES] = {};
 static VkDeviceMemory         g_IndexBufferMemory[IMGUI_VK_QUEUED_FRAMES] = {};
-static size_t                 g_VertexBufferSize[IMGUI_VK_QUEUED_FRAMES] = {};
-static size_t                 g_IndexBufferSize[IMGUI_VK_QUEUED_FRAMES] = {};
+static VkDeviceSize           g_VertexBufferSize[IMGUI_VK_QUEUED_FRAMES] = {};
+static VkDeviceSize           g_IndexBufferSize[IMGUI_VK_QUEUED_FRAMES] = {};
 static VkBuffer               g_VertexBuffer[IMGUI_VK_QUEUED_FRAMES] = {};
 static VkBuffer               g_IndexBuffer[IMGUI_VK_QUEUED_FRAMES] = {};
 
@@ -164,7 +164,7 @@ void ImGui_ImplGlfwVulkan_RenderDrawLists(ImDrawData* draw_data)
             vkDestroyBuffer(g_Device, g_VertexBuffer[g_FrameIndex], g_Allocator);
         if (g_VertexBufferMemory[g_FrameIndex])
             vkFreeMemory(g_Device, g_VertexBufferMemory[g_FrameIndex], g_Allocator);
-        size_t vertex_buffer_size = ((vertex_size-1) / g_BufferMemoryAlignment+1) * g_BufferMemoryAlignment;
+        VkDeviceSize vertex_buffer_size = ((vertex_size-1) / g_BufferMemoryAlignment+1) * g_BufferMemoryAlignment;
         VkBufferCreateInfo buffer_info = {};
         buffer_info.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
         buffer_info.size = vertex_buffer_size;
@@ -194,7 +194,7 @@ void ImGui_ImplGlfwVulkan_RenderDrawLists(ImDrawData* draw_data)
             vkDestroyBuffer(g_Device, g_IndexBuffer[g_FrameIndex], g_Allocator);
         if (g_IndexBufferMemory[g_FrameIndex])
             vkFreeMemory(g_Device, g_IndexBufferMemory[g_FrameIndex], g_Allocator);
-        size_t index_buffer_size = ((index_size-1) / g_BufferMemoryAlignment+1) * g_BufferMemoryAlignment;
+        VkDeviceSize index_buffer_size = ((index_size-1) / g_BufferMemoryAlignment+1) * g_BufferMemoryAlignment;
         VkBufferCreateInfo buffer_info = {};
         buffer_info.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
         buffer_info.size = index_buffer_size;