diff --git a/profiles/package.mask b/profiles/package.mask
index 193e0ee853bce..c67b963283456 100644
--- a/profiles/package.mask
+++ b/profiles/package.mask
@@ -33,6 +33,13 @@
 
 #--- END OF EXAMPLES ---
 
+# Michał Górny <mgorny@gentoo.org> (2023-07-12)
+# Having scikit-build-core installed still breaks building setuptools
+# extensions in some scenarios.
+# https://github.com/scikit-build/scikit-build-core/issues/426
+>=dev-python/iminuit-2.22
+=dev-python/scikit-build-core-0.4.7-r1
+
 # Hans de Graaff <graaff@gentoo.org> (2023-07-08)
 # Obsolete component for dev-util/cucumber. Discontinued upstream.
 # No reverse dependencies. Masked for removal on 2023-08-08.