diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2807274cb13..6ffc60dc6a0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -431,7 +431,7 @@ bundler:audit:
     - bundle exec rake db:drop db:create db:schema:load db:seed_fu
     - git checkout $CI_COMMIT_SHA
     - bundle install --without production --jobs $(nproc) $FLAGS --retry=3
-    - source scripts/prepare_build.sh
+    - . scripts/prepare_build.sh
     - bundle exec rake db:migrate
 
 migration pg paths:
diff --git a/scripts/prepare_build.sh b/scripts/prepare_build.sh
index b176830ffb4..8c5ffe92960 100755
--- a/scripts/prepare_build.sh
+++ b/scripts/prepare_build.sh
@@ -3,9 +3,14 @@
 . scripts/utils.sh
 
 export SETUP_DB=${SETUP_DB:-true}
-export GITLAB_DATABASE=$(echo $CI_JOB_NAME | cut -f2 -d' ')
 export USE_BUNDLE_INSTALL=${USE_BUNDLE_INSTALL:-true}
 
+# Determine the database by looking at the job name.
+# For example, we'll get pg if the job is `rspec pg 19 20`
+export GITLAB_DATABASE=$(echo $CI_JOB_NAME | cut -f2 -d' ')
+
+# This would make the default database postgresql, and we could also use
+# pg to mean postgresql.
 if [ "$GITLAB_DATABASE" != 'mysql' ]; then
     export GITLAB_DATABASE='postgresql'
 fi