diff --git a/sys/compat/linux/linux_getcwd.c b/sys/compat/linux/linux_getcwd.c
index 9b810a38ca38..53aae454c23e 100644
--- a/sys/compat/linux/linux_getcwd.c
+++ b/sys/compat/linux/linux_getcwd.c
@@ -465,8 +465,10 @@ linux_getcwd(struct thread *td, struct linux_getcwd_args *args)
 		 * limit it to N/2 vnodes for an N byte buffer.
 		 */
 
+		mtx_lock(&Giant);
 		error = linux_getcwd_common (td->td_proc->p_fd->fd_cdir, NULL,
 		    &bp, path, len/2, GETCWD_CHECK_ACCESS, td);
+		mtx_unlock(&Giant);
 
 		if (error)
 			goto out;