diff --git a/profiles/pentoo/base/package.mask b/profiles/pentoo/base/package.mask
index 5c2b3f1c5..112fceeb4 100644
--- a/profiles/pentoo/base/package.mask
+++ b/profiles/pentoo/base/package.mask
@@ -180,3 +180,7 @@ dev-lang/lua:0
 #known udev bug, upgrade immediately
 #https://github.com/systemd/systemd/issues/22801
 <sys-apps/systemd-utils-252.5
+
+# https://bugs.gentoo.org/897934
+# [TRACKER] Breakage with >=dev-python/cython-3
+>dev-python/cython-3.0.0