diff --git a/cmd/fdt.c b/cmd/fdt.c
index 279dad9fe1..bc19303159 100644
--- a/cmd/fdt.c
+++ b/cmd/fdt.c
@@ -466,9 +466,9 @@ static int do_fdt(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 						return ret;
 				} else if (subcmd[0] == 'a') {
 					/* Get address */
-					char buf[11];
+					char buf[19];
 
-					sprintf(buf, "0x%p", nodep);
+					snprintf(buf, sizeof(buf), "0x%p", nodep);
 					env_set(var, buf);
 				} else if (subcmd[0] == 's') {
 					/* Get size */