diff --git a/smartdns/Makefile b/smartdns/Makefile
index e0ef2a5..5539aa1 100644
--- a/smartdns/Makefile
+++ b/smartdns/Makefile
@@ -108,6 +108,7 @@ define Build/Compile/smartdns-ui
 	CARGO_BUILD_ARGS="$(if $(strip $(RUST_PKG_FEATURES)),--features "$(strip $(RUST_PKG_FEATURES))") --profile $(CARGO_PKG_PROFILE)"
 	+$(CARGO_PKG_VARS) CARGO_BUILD_ARGS="$(CARGO_BUILD_ARGS)" CC=$(TARGET_CC) \
 	PATH="$$(PATH):$(CARGO_HOME)/bin" \
+	AWS_LC_SYS_CFLAGS="-O0" \
 	make -C $(PKG_BUILD_DIR)/plugin/smartdns-ui
 endef