diff --git a/tools/nixery/.travis.yml b/tools/nixery/.travis.yml
index 950de21f7..46c2a9778 100644
--- a/tools/nixery/.travis.yml
+++ b/tools/nixery/.travis.yml
@@ -28,6 +28,8 @@ script:
       -e BUCKET=nixery-layers \
       -e GOOGLE_CLOUD_PROJECT=nixery \
       -e GOOGLE_APPLICATION_CREDENTIALS=/var/nixery/key.json \
+      -e GCS_SIGNING_ACCOUNT="${GCS_SIGNING_ACCOUNT}" \
+      -e GCS_SIGNING_KEY=/var/nixery/gcs.pem \
       ${IMG}
 
   # print all of the container's logs regardless of success