diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index c5537166d9..a757939cfb 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -729,7 +729,6 @@ static void *fw_cfg_modify_bytes_read(FWCfgState *s, uint16_t key,
     ptr = s->entries[arch][key].data;
     s->entries[arch][key].data = data;
     s->entries[arch][key].len = len;
-    s->entries[arch][key].callback_opaque = NULL;
     s->entries[arch][key].allow_write = false;
 
     return ptr;