diff --git a/src/vulkan/runtime/vk_fence.h b/src/vulkan/runtime/vk_fence.h
index 1fe7a224ee8..12cb1ab315a 100644
--- a/src/vulkan/runtime/vk_fence.h
+++ b/src/vulkan/runtime/vk_fence.h
@@ -51,7 +51,7 @@ struct vk_fence {
     *
     * This field must be last
     */
-   _Alignas(8) struct vk_sync permanent;
+   alignas(8) struct vk_sync permanent;
 };
 
 VK_DEFINE_NONDISP_HANDLE_CASTS(vk_fence, base, VkFence,
diff --git a/src/vulkan/runtime/vk_semaphore.h b/src/vulkan/runtime/vk_semaphore.h
index 06492144a95..141f39a3f4d 100644
--- a/src/vulkan/runtime/vk_semaphore.h
+++ b/src/vulkan/runtime/vk_semaphore.h
@@ -55,7 +55,7 @@ struct vk_semaphore {
     *
     * This field must be last
     */
-   _Alignas(8) struct vk_sync permanent;
+   alignas(8) struct vk_sync permanent;
 };
 
 VK_DEFINE_NONDISP_HANDLE_CASTS(vk_semaphore, base, VkSemaphore,