diff --git a/coreutils/truncate.c b/coreutils/truncate.c
index e5fa656..4c997bf 100644
--- a/coreutils/truncate.c
+++ b/coreutils/truncate.c
@@ -64,7 +64,7 @@
 
 	argv += optind;
 	while (*argv) {
-		int fd = open(*argv, flags);
+		int fd = open(*argv, flags, 0666);
 		if (fd < 0) {
 			if (errno != ENOENT || !(opts & OPT_NOCREATE)) {
 				bb_perror_msg("%s: open", *argv);