diff --git a/python/scripts/sd_nspawn.py b/python/scripts/sd_nspawn.py
index 3d96582e..1fcf8cba 100755
--- a/python/scripts/sd_nspawn.py
+++ b/python/scripts/sd_nspawn.py
@@ -104,6 +104,15 @@ def _add_dynamic_mounts(self, name):
                 self.data['Files']['Bind'].append(item)
 
         for mount in ro_mounts:
+            # If it is a temporary directory that does not exist already, just
+            # created it so that the next check passes.
+            if mount.startswith('/var/tmp'):
+                Path(mount).mkdir(exist_ok=True)
+                # tmux specifically checks to make sure the permissions of the
+                # directory are restrictive and refuses to connect if they are
+                # not right so fix them up.
+                if 'tmux-' in mount:
+                    Path(mount).chmod(0o700)
             if Path(mount).exists():
                 self.data['Files']['BindReadOnly'].append(mount)