diff --git a/conf/nonclangable.conf b/conf/nonclangable.conf
index 6eeb2cab..4f9f3ff5 100644
--- a/conf/nonclangable.conf
+++ b/conf/nonclangable.conf
@@ -291,7 +291,8 @@ CFLAGS:append:pn-qtbase:toolchain-clang:arm = " -no-integrated-as"
 #../git/common/connection.c:154:55: error: comparison of integers of different signs: 'unsigned long' and 'int' [-Werror,-Wsign-compare]
 #        for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg)) {
 #                                                             ^~~~~~~~~~~~~~~~~~~~~~
-CFLAGS:append:pn-seatd:toolchain-clang = " -Wno-sign-compare"
+CFLAGS:append:pn-seatd:toolchain-clang = " -Wno-error=sign-compare"
+CXXFLAGS:append:pn-ot-br-posix:toolchain-clang = " -Wno-error=sign-compare"
 
 # -fno-tree-vrp is gcc specific
 CXXFLAGS:remove:pn-mozjs:toolchain-clang = "-fno-tree-vrp"