diff --git a/pub.js b/pub.js
index f273785..ca222eb 100644
--- a/pub.js
+++ b/pub.js
@@ -149,7 +149,7 @@ function upload(file, repositoryFilename) {
 }
 
 function exportLibraries() {
-  let defs = libs.all.map(a => `
+  let defs = libs.all.filter(l => !l.internal).map(a => `
     .lib('${a.target}', ${strings(a.jars)}${options(a.options)})`)
 
   let content = `// Generated by 'node up --publish'