diff --git a/src/Magnum/Vk/Extensions.h b/src/Magnum/Vk/Extensions.h
index 0057ad49a..6de3f552a 100644
--- a/src/Magnum/Vk/Extensions.h
+++ b/src/Magnum/Vk/Extensions.h
@@ -172,6 +172,7 @@ namespace EXT {
     _extension(72, KHR,ray_query,                           Vk11, None) // #349
 }
 #undef _extension
+#undef _extension_
 
 #endif