diff --git a/dev-libs/open62541/open62541-1.4.2.ebuild b/dev-libs/open62541/open62541-1.4.2.ebuild
index 1fb7eb285b..a4226411bf 100644
--- a/dev-libs/open62541/open62541-1.4.2.ebuild
+++ b/dev-libs/open62541/open62541-1.4.2.ebuild
@@ -50,6 +50,7 @@ src_configure() {
 		-DUA_BUILD_EXAMPLES=OFF
 		-DUA_BUILD_TOOLS=$(usex tools)
 		-DUA_BUILD_UNIT_TESTS=OFF
+		-DUA_ENABLE_HARDENING=OFF
 		-DUA_ENABLE_PUBSUB=$(usex pubsub)
 		-DUA_ENABLE_PUBSUB_INFORMATIONMODEL=$(usex pubsub)
 		-DUA_FORCE_WERROR=OFF