diff --git a/appveyor.yml b/appveyor.yml
index bf4fb3f17..6d7eaa571 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -47,4 +47,5 @@ install:
 build_script:
   - set YACC=.\win_flex_bison\win_bison.exe
   - set MRUBY_CONFIG=appveyor_config.rb
+  - rake -m all
   - rake -E $stdout.sync=true test