diff --git a/openwrt/package/libol/Makefile b/openwrt/package/libol/Makefile
index 9205184ca..f027a4259 100644
--- a/openwrt/package/libol/Makefile
+++ b/openwrt/package/libol/Makefile
@@ -52,7 +52,9 @@ $(PKG_BUILD_DIR)/.configured:
 $(PKG_BUILD_DIR)/.built:
 	rm -rf $(PKG_INSTALL_DIR)
 	mkdir -p $(PKG_INSTALL_DIR)
+	# pass CFLAGS again to override -O2 set by configure
 	$(MAKE) -C $(PKG_BUILD_DIR) \
+		CFLAGS="$(TARGET_CFLAGS)" \
 		DESTDIR="$(PKG_INSTALL_DIR)" \
 		all install
 	touch $@