diff --git a/base/VulkanDebug.cpp b/base/VulkanDebug.cpp
index 165cc865..8f642bfa 100644
--- a/base/VulkanDebug.cpp
+++ b/base/VulkanDebug.cpp
@@ -40,7 +40,7 @@ namespace vks
 
 		VkDebugReportCallbackEXT msgCallback;
 
-		VkBool32 messageCallback(
+		VKAPI_ATTR VkBool32 VKAPI_CALL messageCallback(
 			VkDebugReportFlagsEXT flags,
 			VkDebugReportObjectTypeEXT objType,
 			uint64_t srcObject,
diff --git a/base/VulkanDebug.h b/base/VulkanDebug.h
index 56882b8f..3cf29a05 100644
--- a/base/VulkanDebug.h
+++ b/base/VulkanDebug.h
@@ -31,7 +31,7 @@ namespace vks
 		extern const char *validationLayerNames[];
 
 		// Default debug callback
-		VkBool32 messageCallback(
+		VKAPI_ATTR VkBool32 VKAPI_CALL messageCallback(
 			VkDebugReportFlagsEXT flags,
 			VkDebugReportObjectTypeEXT objType,
 			uint64_t srcObject,