diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 22c3bdc..32bfa1f 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -302,7 +304,9 @@ __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
 		return -EFAULT;
 
 	if (_NSIG_WORDS > 1) {
-		if (__copy_to_user(&frame->extramask, &set->sig[1],
+		unsigned long sigcopy;
+		memcpy(&sigcopy, &set->sig[1], sizeof(frame->extramask));
+		if (__copy_to_user(&frame->extramask, &sigcopy,
 				   sizeof(frame->extramask)))
 			return -EFAULT;
 	}