diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index 235e0518d6..7af19fa06c 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -787,7 +787,7 @@ static void sd_function_switch(SDState *sd, uint32_t arg)
         sd->data[14 + (i >> 1)] = new_func << ((i * 4) & 4);
     }
     memset(&sd->data[17], 0, 47);
-    stw_be_p(sd->data + 65, sd_crc16(sd->data, 64));
+    stw_be_p(sd->data + 64, sd_crc16(sd->data, 64));
 }
 
 static inline bool sd_wp_addr(SDState *sd, uint64_t addr)