diff --git a/src/SDL2.cs b/src/SDL2.cs
index b79bb21..24270b2 100644
--- a/src/SDL2.cs
+++ b/src/SDL2.cs
@@ -1895,7 +1895,7 @@ namespace SDL2
 		public static extern SDL_bool SDL_Vulkan_CreateSurface(
 			IntPtr window,
 			IntPtr instance,
-			out IntPtr surface
+			out ulong surface
 		);
 
 		/* window refers to an SDL_Window*.