diff --git a/.travis.yml b/.travis.yml
index 689126308..cfb194dbc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,8 @@ mono: none
 dotnet: 1.0.1
 before_install:
   - sudo apt-get install sshpass
+install:
+  - nuget install JetBrains.ExternalAnnotations
 script:
 - scripts/build.sh
 env: