diff --git a/arch/s390/pci/pci_insn.c b/arch/s390/pci/pci_insn.c
index dcc2634ccbe2..10ca15dcab11 100644
--- a/arch/s390/pci/pci_insn.c
+++ b/arch/s390/pci/pci_insn.c
@@ -16,11 +16,11 @@
 static inline void zpci_err_insn(u8 cc, u8 status, u64 req, u64 offset)
 {
 	struct {
-		u8 cc;
-		u8 status;
 		u64 req;
 		u64 offset;
-	} data = {cc, status, req, offset};
+		u8 cc;
+		u8 status;
+	} __packed data = {req, offset, cc, status};
 
 	zpci_err_hex(&data, sizeof(data));
 }