diff --git a/xo-imgui/example/ex4a/VulkanApp.cpp b/xo-imgui/example/ex4a/VulkanApp.cpp
index ed97f3a5..b6cdf70f 100644
--- a/xo-imgui/example/ex4a/VulkanApp.cpp
+++ b/xo-imgui/example/ex4a/VulkanApp.cpp
@@ -473,12 +473,12 @@ MinimalImGuiVulkan::main_loop()
 {
     SDL_Event event;
 
-    while (!quit) {
+    while (!quit_flag_) {
         while (SDL_PollEvent(&event)) {
             ImGui_ImplSDL2_ProcessEvent(&event);
 
             if (event.type == SDL_QUIT) {
-                quit = true;
+                this->quit_flag_ = true;
             }
         }
 
diff --git a/xo-imgui/example/ex4a/VulkanApp.hpp b/xo-imgui/example/ex4a/VulkanApp.hpp
index fa6a576c..c820be2a 100644
--- a/xo-imgui/example/ex4a/VulkanApp.hpp
+++ b/xo-imgui/example/ex4a/VulkanApp.hpp
@@ -284,5 +284,5 @@ private:
      * until swapchain in consistent state.
      */
     bool framebuffer_resized_flag_ = false;
-    bool quit = false;
+    bool quit_flag_ = false;
 }; /*MinimalImGuiVulkan*/