diff --git a/commands/ubi.c b/commands/ubi.c
index 4c445d2..5e27584 100644
--- a/commands/ubi.c
+++ b/commands/ubi.c
@@ -42,7 +42,7 @@
 		return 1;
 	}
 
-	fd_vol = open(argv[optind], O_WRONLY);
+	fd_vol = open(argv[optind], O_WRONLY | O_TRUNC);
 	if (fd_vol < 0) {
 		perror("open volume");
 		ret = 1;