diff --git a/lib/fp/build-modules.js b/lib/fp/build-modules.js
index 65d079d4e..39d188bd7 100644
--- a/lib/fp/build-modules.js
+++ b/lib/fp/build-modules.js
@@ -93,7 +93,9 @@ function build(target) {
   // Add FP alias and remapped module paths.
   _.each([mapping.aliasToReal, mapping.rename], function(data) {
     _.forOwn(data, function(realName, alias) {
-      modulePaths.push(path.join(target, alias + '.js'));
+      if (!_.startsWith(alias, '_')) {
+        modulePaths.push(path.join(target, alias + '.js'));
+      }
     });
   });