diff --git a/package/fwts/fwts.mk b/package/fwts/fwts.mk
index f04c7a848f..3af54a1afd 100644
--- a/package/fwts/fwts.mk
+++ b/package/fwts/fwts.mk
@@ -15,6 +15,10 @@ FWTS_DEPENDENCIES = host-bison host-flex host-pkgconf libglib2 libbsd \
 	$(if $(BR2_PACKAGE_BASH_COMPLETION),bash-completion) \
 	$(if $(BR2_PACKAGE_DTC),dtc)
 
+ifeq ($(BR2_OPTIMIZE_0),y)
+FWTS_CONF_ENV = CFLAGS="$(TARGET_CFLAGS) -O1"
+endif
+
 ifeq ($(BR2_PACKAGE_FWTS_EFI_RUNTIME_MODULE),y)
 FWTS_MODULE_SUBDIRS = efi_runtime
 $(eval $(kernel-module))