diff --git a/src/modules/mavlink/mavlink_ftp.cpp b/src/modules/mavlink/mavlink_ftp.cpp
index c074d1dde6..e8ea9c89b9 100644
--- a/src/modules/mavlink/mavlink_ftp.cpp
+++ b/src/modules/mavlink/mavlink_ftp.cpp
@@ -797,7 +797,7 @@ MavlinkFTP::_copy_file(const char *src_path, const char *dst_path, size_t length
 	dst_fd = ::open(dst_path, O_CREAT | O_TRUNC | O_WRONLY
 // POSIX requires the permissions to be supplied if O_CREAT passed
 #ifdef __PX4_POSIX
-			, 0x0777
+			, 0666
 #endif
 			);
 	if (dst_fd < 0) {
diff --git a/src/modules/sdlog2/sdlog2.c b/src/modules/sdlog2/sdlog2.c
index e379c2168e..f6d24fbd30 100644
--- a/src/modules/sdlog2/sdlog2.c
+++ b/src/modules/sdlog2/sdlog2.c
@@ -576,7 +576,7 @@ int open_perf_file(const char* str)
 #ifdef __PX4_NUTTX
 	int fd = open(log_file_path, O_CREAT | O_WRONLY | O_DSYNC);
 #else
-	int fd = open(log_file_path, O_CREAT | O_WRONLY | O_DSYNC, 0x0777);
+	int fd = open(log_file_path, O_CREAT | O_WRONLY | O_DSYNC, 0666);
 #endif
 
 	if (fd < 0) {