diff --git a/mrbgems/default.gembox b/mrbgems/default.gembox
index e3bd114f3..dab7230aa 100644
--- a/mrbgems/default.gembox
+++ b/mrbgems/default.gembox
@@ -74,9 +74,6 @@ MRuby::GemBox.new do |conf|
   # Use class/module extension
   conf.gem :core => "mruby-class-ext"
 
-  # Use inline struct
-  conf.gem :core => "mruby-inline-struct"
-
   # Use mruby-compiler to build other mrbgems
   conf.gem :core => "mruby-compiler"
 end