diff --git a/components/mruby/build_config.rb b/components/mruby/build_config.rb
index 23c062b..d5706e0 100644
--- a/components/mruby/build_config.rb
+++ b/components/mruby/build_config.rb
@@ -40,6 +40,8 @@
     cc.defines << %w(MRB_STR_BUF_MIN_SIZE=20)
     cc.defines << %w(MRB_GC_STRESS)
     cc.defines << %w(POOL_PAGE_SIZE=256)
+    cc.defines << %w(MRB_NO_BOXING)
+    cc.defines << %w(MRB_USE_METHOD_T_STRUCT)
   end
 
   conf.cxx do |cxx|
diff --git a/main/component.mk b/main/component.mk
index ca3fb0e..7a7607f 100644
--- a/main/component.mk
+++ b/main/component.mk
@@ -1 +1,2 @@
 COMPONENT_DEPENDS = mruby
+CFLAGS += -DMRB_NO_BOXING