diff --git a/xo-imgui/example/ex4a/VulkanApp.cpp b/xo-imgui/example/ex4a/VulkanApp.cpp
index 3e3810a6..18bce2d1 100644
--- a/xo-imgui/example/ex4a/VulkanApp.cpp
+++ b/xo-imgui/example/ex4a/VulkanApp.cpp
@@ -424,7 +424,7 @@ MinimalImGuiVulkan::init_imgui()
     // Upload Fonts
     VkCommandBuffer command_buffer = begin_single_time_commands();
     ImGui_ImplVulkan_CreateFontsTexture();
-    endSingleTimeCommands(command_buffer);
+    this->end_single_time_commands(command_buffer);
 
     //ImGui_ImplVulkan_DestroyFontUploadObjects();
 }
@@ -450,4 +450,20 @@ MinimalImGuiVulkan::begin_single_time_commands()
     return cmdbuf;
 }
 
+void
+MinimalImGuiVulkan::end_single_time_commands(VkCommandBuffer commandBuffer)
+{
+    vkEndCommandBuffer(commandBuffer);
+
+    VkSubmitInfo submit_info{};
+    submit_info.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
+    submit_info.commandBufferCount = 1;
+    submit_info.pCommandBuffers = &commandBuffer;
+
+    vkQueueSubmit(graphics_queue_, 1, &submit_info, VK_NULL_HANDLE);
+    vkQueueWaitIdle(graphics_queue_);
+
+    vkFreeCommandBuffers(device_, command_pool_, 1, &commandBuffer);
+}
+
 /* end VulkanApp.cpp */
diff --git a/xo-imgui/example/ex4a/VulkanApp.hpp b/xo-imgui/example/ex4a/VulkanApp.hpp
index 1bffd1b2..87524eec 100644
--- a/xo-imgui/example/ex4a/VulkanApp.hpp
+++ b/xo-imgui/example/ex4a/VulkanApp.hpp
@@ -98,19 +98,10 @@ private:
      */
     VkCommandBuffer begin_single_time_commands();
 
-    void endSingleTimeCommands(VkCommandBuffer commandBuffer) {
-        vkEndCommandBuffer(commandBuffer);
-
-        VkSubmitInfo submitInfo{};
-        submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
-        submitInfo.commandBufferCount = 1;
-        submitInfo.pCommandBuffers = &commandBuffer;
-
-        vkQueueSubmit(graphics_queue_, 1, &submitInfo, VK_NULL_HANDLE);
-        vkQueueWaitIdle(graphics_queue_);
-
-        vkFreeCommandBuffers(device_, command_pool_, 1, &commandBuffer);
-    }
+    /* complete command buffer begun with begin_single_time_commands();
+     * also submit, wait for completion + cleanup
+     */
+    void end_single_time_commands(VkCommandBuffer commandBuffer);
 
     void main_loop() {
         SDL_Event event;