diff --git a/assets/build/install.sh b/assets/build/install.sh
index 1d73e2bb..1e0ed45b 100755
--- a/assets/build/install.sh
+++ b/assets/build/install.sh
@@ -163,6 +163,7 @@ exec_as_git cp ${GITLAB_INSTALL_DIR}/config/database.yml.mysql ${GITLAB_INSTALL_
 
 # Installs nodejs packages required to compile webpack
 exec_as_git yarn install --production --pure-lockfile
+exec_as_git yarn add ajv@^4.0.0
 
 echo "Compiling assets. Please be patient, this could take a while..."
 exec_as_git bundle exec rake gitlab:assets:compile USE_DB=false SKIP_STORAGE_VALIDATION=true