diff --git a/cmd/io.c b/cmd/io.c
index c59148f413cf2ef3873d1f4016ae08e3d16d3850..ad05f7ca5a32a62f115748c1b0972e89f678e15d 100644
--- a/cmd/io.c
+++ b/cmd/io.c
@@ -46,7 +46,8 @@ int do_io_iod(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 
 int do_io_iow(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
-	ulong addr, size, val;
+	ulong addr, val;
+	int size;
 
 	if (argc != 3)
 		return CMD_RET_USAGE;