diff --git a/.travis.yml b/.travis.yml
index 4b77784c..2a536a3a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,6 +14,7 @@ services:
 
 before_install:
   - docker pull openjdk:9.0.1-11
+  - docker pull alpine:latest
 
 cache:
   directories: