diff --git a/.travis.yml b/.travis.yml
index 2548332c7..01e69363a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,7 @@ go:
   - 1.x
 
 before_install:
+  - sudo sh -c "apt-get -qq update && apt-get install -y gcc-multilib"
   - go get -u github.com/cpuguy83/go-md2man
   - go get -u github.com/vbatts/git-validation
   - go get -u github.com/golang/lint/golint
@@ -24,4 +25,5 @@ notifications:
 
 script:
   - chmod a+rwx . # Necessary to make Travis co-operate with Docker.
+  - make GOARCH=386 umoci umoci.static # Make sure 32-bit builds work.
   - make DOCKER_IMAGE=$DOCKER_IMAGE ci