diff --git a/packages/openwrt/net/nDPId-testing/Makefile b/packages/openwrt/net/nDPId-testing/Makefile
index fcb0a491..902f3fd6 100644
--- a/packages/openwrt/net/nDPId-testing/Makefile
+++ b/packages/openwrt/net/nDPId-testing/Makefile
@@ -53,6 +53,7 @@ CMAKE_OPTIONS += -DENABLE_MEMORY_PROFILING=OFF
 CMAKE_OPTIONS += -DSTATIC_LIBNDPI_INSTALLDIR="$(PKG_BUILD_DIR)/libnDPI/install"
 
 TARGET_CFLAGS += -DLIBNDPI_STATIC=1
+TARGET_CFLAGS += -Werror
 
 ifneq ($(CONFIG_LIBNDPI_GCRYPT),)
 CMAKE_OPTIONS += -DNDPI_WIDTH_GCRYPT=ON