diff --git a/include/linux/errqueue.h b/include/linux/errqueue.h
index c015120..1b2109b 100644
--- a/include/linux/errqueue.h
+++ b/include/linux/errqueue.h
@@ -2,6 +2,8 @@
 #ifndef _UAPI_LINUX_ERRQUEUE_H
 #define _UAPI_LINUX_ERRQUEUE_H
 
+#error foo
+
 #include <linux/types.h>
 
 struct sock_extended_err {