diff --git a/build_config.rb b/build_config.rb
index 83dc01940..85d94df14 100644
--- a/build_config.rb
+++ b/build_config.rb
@@ -8,6 +8,8 @@ MRuby::Build.new do |conf|
     toolchain :gcc
   end
 
+  enable_debug
+
   # Use mrbgems
   # conf.gem 'examples/mrbgems/ruby_extension_example'
   # conf.gem 'examples/mrbgems/c_extension_example' do |g|