diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index b5d002e6d7..1e9530f9ae 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -1508,7 +1508,7 @@ static sd_rsp_type_t sd_normal_command(SDState *sd, SDRequest req)
             }
 
             sd->state = sd_sendingdata_state;
-            *(uint32_t *) sd->data = sd_wpbits(sd, req.arg);
+            stl_be_p(sd->data, sd_wpbits(sd, req.arg));
             sd->data_start = addr;
             sd->data_offset = 0;
             return sd_r1;