diff --git a/package/lua/Makefile b/package/lua/Makefile
index 30eac84cc7..206740b0a1 100644
--- a/package/lua/Makefile
+++ b/package/lua/Makefile
@@ -111,6 +111,7 @@ define Build/InstallDev
 	mkdir -p $(1)/usr/include
 	$(CP) $(PKG_INSTALL_DIR)/usr/include/lua{,lib,conf}.h $(1)/usr/include/
 	$(CP) $(PKG_INSTALL_DIR)/usr/include/lauxlib.h $(1)/usr/include/
+	$(CP) $(PKG_INSTALL_DIR)/usr/include/lnum_config.h $(1)/usr/include/
 	mkdir -p $(1)/usr/lib
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/liblua.{a,so.*} $(1)/usr/lib/
 	ln -sf liblua.so.$(PKG_VERSION) $(1)/usr/lib/liblua.so