diff --git a/profiles/arch/loong/package.mask b/profiles/arch/loong/package.mask
index 99e7ba32c1241..fc01ceaef0d99 100644
--- a/profiles/arch/loong/package.mask
+++ b/profiles/arch/loong/package.mask
@@ -1,6 +1,11 @@
 # Copyright 2022-2023 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
+# WANG Xuerui <xen0n@gentoo.org> (2023-09-10)
+# Has correctness issues on loong (failing test_encode_long_neg_conversion),
+# pending debug.
+dev-python/ujson
+
 # WANG Xuerui <xen0n@gentoo.org> (2022-12-05)
 # sys-boot/gnu-efi upstream hasn't merged the loong port yet
 app-crypt/efitools
diff --git a/profiles/arch/loong/package.use.mask b/profiles/arch/loong/package.use.mask
index 6dcdbc7372c3d..d628254293a9d 100644
--- a/profiles/arch/loong/package.use.mask
+++ b/profiles/arch/loong/package.use.mask
@@ -1,6 +1,12 @@
 # Copyright 2022-2023 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
+# WANG Xuerui <xen0n@gentoo.org> (2023-09-10)
+# Revdeps of dev-python/ujson which is masked.
+dev-python/cattrs test
+dev-python/requests-cache test
+dev-python/ruamel-std-pathlib test
+
 # Andrew Ammerlaan <andrewammerlaan@gentoo.org> (2023-08-30)
 # Avoid having to keyword more Qt deps
 dev-python/pyside2 3d datavis script location scxml