diff --git a/tasks/mruby_build.rake b/tasks/mruby_build.rake
index 432100f8d..2891c7d45 100644
--- a/tasks/mruby_build.rake
+++ b/tasks/mruby_build.rake
@@ -220,8 +220,8 @@ module MRuby
     attr_block %w(test_runner)
 
     def initialize(name, build_dir=nil, &block)
-  @test_runner = Command::CrossTestRunner.new(self)
-  super
+      @test_runner = Command::CrossTestRunner.new(self)
+      super
     end
 
     def mrbcfile