diff --git a/MoltenVK/MoltenVK/Layers/MVKExtensions.def b/MoltenVK/MoltenVK/Layers/MVKExtensions.def
index db3c6db5..70fa8865 100644
--- a/MoltenVK/MoltenVK/Layers/MVKExtensions.def
+++ b/MoltenVK/MoltenVK/Layers/MVKExtensions.def
@@ -40,6 +40,7 @@ MVK_EXTENSION(KHR_maintenance2, KHR_MAINTENANCE2)
 MVK_EXTENSION(KHR_push_descriptor, KHR_PUSH_DESCRIPTOR)
 MVK_EXTENSION(KHR_sampler_mirror_clamp_to_edge, KHR_SAMPLER_MIRROR_CLAMP_TO_EDGE)
 MVK_EXTENSION(KHR_shader_draw_parameters, KHR_SHADER_DRAW_PARAMETERS)
+MVK_EXTENSION(KHR_storage_buffer_storage_class, KHR_STORAGE_BUFFER_STORAGE_CLASS)
 MVK_EXTENSION(KHR_surface, KHR_SURFACE)
 MVK_EXTENSION(KHR_swapchain, KHR_SWAPCHAIN)
 MVK_EXTENSION(EXT_shader_viewport_index_layer, EXT_SHADER_VIEWPORT_INDEX_LAYER)