diff --git a/src/tools/fs_shell/unistd.cpp b/src/tools/fs_shell/unistd.cpp
index 2569fc6e46..c4b4ac9207 100644
--- a/src/tools/fs_shell/unistd.cpp
+++ b/src/tools/fs_shell/unistd.cpp
@@ -202,6 +202,13 @@ fssh_ioctl(int fd, unsigned long op, ...)
 }
 
 
+fssh_ssize_t
+fssh_read(int fd, void *buffer, fssh_size_t count)
+{
+	return read(fd, buffer, count);
+}
+
+
 fssh_ssize_t
 fssh_read_pos(int fd, fssh_off_t pos, void *buffer, fssh_size_t count)
 {
@@ -209,6 +216,13 @@ fssh_read_pos(int fd, fssh_off_t pos, void *buffer, fssh_size_t count)
 }
 
 
+fssh_ssize_t
+fssh_write(int fd, const void *buffer, fssh_size_t count)
+{
+	return write(fd, buffer, count);
+}
+
+
 fssh_ssize_t
 fssh_write_pos(int fd, fssh_off_t pos, const void *buffer, fssh_size_t count)
 {