diff --git a/fs/fs.c b/fs/fs.c
index f61ee09..051af8d 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -742,6 +742,28 @@
 }
 EXPORT_SYMBOL(creat);
 
+int ftruncate(int fd, loff_t length)
+{
+	struct fs_driver_d *fsdrv;
+	FILE *f;
+	int ret;
+
+	if (check_fd(fd))
+		return -errno;
+
+	f = &files[fd];
+
+	fsdrv = f->fsdev->driver;
+
+	ret = fsdrv->truncate(&f->fsdev->dev, f, length);
+	if (ret)
+		return ret;
+
+	f->size = length;
+
+	return 0;
+}
+
 int ioctl(int fd, int request, void *buf)
 {
 	struct fs_driver_d *fsdrv;
diff --git a/include/unistd.h b/include/unistd.h
index 31f430a..f392e6d 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -20,5 +20,6 @@
 int readlink(const char *path, char *buf, size_t bufsiz);
 int chdir(const char *pathname);
 const char *getcwd(void);
+int ftruncate(int fd, loff_t length);
 
 #endif /* __UNISTD_H */