diff --git a/src/libostree/ostree-sysroot.h b/src/libostree/ostree-sysroot.h
index af8192fc..d9f5a546 100644
--- a/src/libostree/ostree-sysroot.h
+++ b/src/libostree/ostree-sysroot.h
@@ -101,9 +101,6 @@ GFile * ostree_sysroot_get_deployment_origin_path (GFile   *deployment_path);
 _OSTREE_PUBLIC
 gboolean ostree_sysroot_lock (OstreeSysroot  *self, GError **error);
 
-_OSTREE_PUBLIC
-gboolean ostree_sysroot_lock_with_mount_namespace (OstreeSysroot  *self, GError **error);
-
 _OSTREE_PUBLIC
 gboolean ostree_sysroot_try_lock (OstreeSysroot         *self,
                                   gboolean              *out_acquired,