diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 54055194e9af320e3b9e675bdebaab77014419c2..4c1ac341ec80633c95194f3c83ab7f358b36189a 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -468,7 +468,7 @@ typedef struct {
 	__u64 refselmk;
 	__u64 refcmpmk;
 	__u64 reserved;
-} __attribute__ ((packed)) pfault_refbk_t;
+} __attribute__ ((packed, aligned(8))) pfault_refbk_t;
 
 int pfault_init(void)
 {