diff --git a/ext/cld/extconf.rb b/ext/cld/extconf.rb
index 8500a27..0537579 100644
--- a/ext/cld/extconf.rb
+++ b/ext/cld/extconf.rb
@@ -1,4 +1,7 @@
 #require 'mkmf'
 #create_makefile('cld/cld')
 
+ENV['CFLAGS'] = ENV['CFLAGS'].to_s + ' -Wno-narrowing'
+ENV['CXXFLAGS'] = ENV['CXXFLAGS'].to_s + ' -Wno-narrowing'
+
 system "./configure --prefix=#{Dir.pwd}" unless File.exists?('Makefile')