--- a/src/common/platform/posix/sdl/sdlglvideo.cpp
+++ b/src/common/platform/posix/sdl/sdlglvideo.cpp
@@ -400,7 +400,7 @@ DFrameBuffer *SDLVideo::CreateFrameBuffe
 				builder.RequireExtension(names[i]);
 			auto instance = builder.Create();
 
-			VkSurfaceKHR surfacehandle = nullptr;
+			VkSurfaceKHR surfacehandle = (VkSurfaceKHR)nullptr;
 			if (!I_CreateVulkanSurface(instance->Instance, &surfacehandle))
 				VulkanError("I_CreateVulkanSurface failed");