diff --git a/common/flatpak-run.c b/common/flatpak-run.c
index ce9c7cb75..d8cb89425 100644
--- a/common/flatpak-run.c
+++ b/common/flatpak-run.c
@@ -2825,6 +2825,8 @@ setup_seccomp (FlatpakBwrap   *bwrap,
     {SCMP_SYS (unshare), EPERM},
     {SCMP_SYS (setns), EPERM},
     {SCMP_SYS (mount), EPERM},
+    {SCMP_SYS (umount), EPERM},
+    {SCMP_SYS (umount2), EPERM},
     {SCMP_SYS (pivot_root), EPERM},
 #if defined(__s390__) || defined(__s390x__) || defined(__CRIS__)
     /* Architectures with CONFIG_CLONE_BACKWARDS2: the child stack