diff --git a/repos/system_upgrade/common/libraries/overlaygen.py b/repos/system_upgrade/common/libraries/overlaygen.py
index b544f88c40..c61e23d160 100644
--- a/repos/system_upgrade/common/libraries/overlaygen.py
+++ b/repos/system_upgrade/common/libraries/overlaygen.py
@@ -7,7 +7,7 @@
 from leapp.libraries.common import mounting, utils
 from leapp.libraries.stdlib import api, CalledProcessError, run
 
-OVERLAY_DO_NOT_MOUNT = ('tmpfs', 'devpts', 'sysfs', 'proc', 'cramfs', 'sysv', 'vfat')
+OVERLAY_DO_NOT_MOUNT = ('tmpfs', 'devtmpfs', 'devpts', 'sysfs', 'proc', 'cramfs', 'sysv', 'vfat')
 
 
 MountPoints = namedtuple('MountPoints', ['fs_file', 'fs_vfstype'])