diff --git a/test/units/TEST-50-DISSECT.sysext.sh b/test/units/TEST-50-DISSECT.sysext.sh
index 866e932f16..26bec15351 100755
--- a/test/units/TEST-50-DISSECT.sysext.sh
+++ b/test/units/TEST-50-DISSECT.sysext.sh
@@ -1328,13 +1328,13 @@ test -f /usr/lib/systemd/system/some_file
 mountpoint /usr/share
 touch /tmp/foo/abc
 test -f /usr/share/abc
-umount /usr/share
+umount -l /usr/share
 test ! -f /usr/share/abc
 mount --bind /tmp/foo /usr/share
 systemd-sysext unmerge
 test ! -f /usr/lib/systemd/system/some_file
 mountpoint /usr/share
-umount /usr/share
+umount -l /usr/share
 rm -f /var/lib/extensions/app0.raw
 
 exit 0