diff --git a/kernel/signal.c b/kernel/signal.c
index fe8ed29..aa9bf00 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3585,6 +3585,10 @@
 
 void __init signals_init(void)
 {
+	/* If this check fails, the __ARCH_SI_PREAMBLE_SIZE value is wrong! */
+	BUILD_BUG_ON(__ARCH_SI_PREAMBLE_SIZE
+		!= offsetof(struct siginfo, _sifields._pad));
+
 	sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC);
 }