diff --git a/jenkins/jobs/diskimage-builder.yaml b/jenkins/jobs/diskimage-builder.yaml
index 55ecc28a8e..77f7f3a83b 100644
--- a/jenkins/jobs/diskimage-builder.yaml
+++ b/jenkins/jobs/diskimage-builder.yaml
@@ -17,6 +17,12 @@
             openstack/diskimage-builder \
             openstack/dib-utils
 
+          # We do things that might exceed the default 2GiB tmpfs, and
+          # use the larger mounted space.
+          mkdir /opt/dib_cache
+          export DIB_NO_TMPFS=1
+          export TMPDIR=/opt/dib_cache
+
           virtualenv env
 
           ./env/bin/pip install $(pwd)/openstack/dib-utils