diff --git a/kernel/ovpn-dco/Makefile b/kernel/ovpn-dco/Makefile
index 2e94fe9fb7..ffd72cb56a 100644
--- a/kernel/ovpn-dco/Makefile
+++ b/kernel/ovpn-dco/Makefile
@@ -37,6 +37,7 @@ define KernelPackage/ovpn-dco/description
 endef
 
 NOSTDINC_FLAGS += \
+	$(KERNEL_NOSTDINC_FLAGS) \
 	-I$(PKG_BUILD_DIR)/include \
 	-include $(PKG_BUILD_DIR)/linux-compat.h