diff --git a/.travis.yml b/.travis.yml
index 54314a6..0041d35 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -442,6 +442,7 @@ install:
   - git submodule update --init libs/preprocessor
   - git submodule update --init libs/static_assert
   - git submodule update --init libs/throw_exception
+  - git submodule update --init libs/type_index
   - git submodule update --init libs/utility
   - cp -r $TRAVIS_BUILD_DIR/* libs/type_traits
   - ./bootstrap.sh
diff --git a/appveyor.yml b/appveyor.yml
index 7ab10e2..6be1e31 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -58,6 +58,7 @@ install:
   - git submodule update --init libs/preprocessor
   - git submodule update --init libs/static_assert
   - git submodule update --init libs/throw_exception
+  - git submodule update --init libs/type_index
   - git submodule update --init libs/utility
   - xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\type_traits
   - bootstrap