diff --git a/appveyor.yml b/appveyor.yml
index a23a04c1..fcc89a3d 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -24,6 +24,8 @@ install:
   - bundle install --jobs 3 --retry 3
 
 build_script:
+  - git submodule init
+  - git submodule update
   - bundle exec rake compile
 
 test_script: