diff --git a/nemu/src/monitor/sdb/sdb.c b/nemu/src/monitor/sdb/sdb.c
index 6fd3055..f9758fe 100644
--- a/nemu/src/monitor/sdb/sdb.c
+++ b/nemu/src/monitor/sdb/sdb.c
@@ -189,6 +189,7 @@ static int cmd_x(char *args) {
   word_t addr = parse_expr(arg, &res);
   if (!res)
     goto wrong_usage;
+  addr = addr & ~0x3;
   for (paddr_t paddr = addr; paddr < addr + n;
        paddr += WORD_BYTES) {
     word_t value = paddr_read(addr, WORD_BYTES);