diff --git a/jjb/externalapi/externalapi-nbi.yaml b/jjb/externalapi/externalapi-nbi.yaml
index 66bb307..4c69d4c 100644
--- a/jjb/externalapi/externalapi-nbi.yaml
+++ b/jjb/externalapi/externalapi-nbi.yaml
@@ -29,6 +29,7 @@
       - 'master':
           branch: 'master'
     mvn-settings: 'externalapi-nbi-settings'
+    java-version: openjdk11
     files: '**'
     archive-artifacts: ''
     build-node: ubuntu1604-builder-4c-4g