diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 5405519..4c1ac34 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -468,7 +468,7 @@
 	__u64 refselmk;
 	__u64 refcmpmk;
 	__u64 reserved;
-} __attribute__ ((packed)) pfault_refbk_t;
+} __attribute__ ((packed, aligned(8))) pfault_refbk_t;
 
 int pfault_init(void)
 {