diff --git a/servo/.travis.yml b/servo/.travis.yml
index 2a2e6fc9257f..2572ae3ddfdb 100644
--- a/servo/.travis.yml
+++ b/servo/.travis.yml
@@ -8,7 +8,9 @@ matrix:
       cache: false
     - sudo: 9000
       dist: trusty
-      script: ./mach build -d --verbose
+      script:
+         - ./mach build -d --verbose
+         - bash etc/ci/lockfile_changed.sh
       cache:
         directories:
           - .cargo
diff --git a/servo/etc/ci/lockfile_changed.sh b/servo/etc/ci/lockfile_changed.sh
new file mode 100755
index 000000000000..7aa1ccccfcaa
--- /dev/null
+++ b/servo/etc/ci/lockfile_changed.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+diff=$(git diff -- */*/Cargo.lock)
+echo "$diff"
+[[ ! $diff ]]