diff --git a/updates.js b/updates.js
index 203d5bb..c76ea06 100755
--- a/updates.js
+++ b/updates.js
@@ -225,9 +225,13 @@ try {
   finish(new Error(`Error parsing package.json: ${err.message}`));
 }
 
+function flat(arr) {
+  return [].concat(...arr);
+}
+
 let include, exclude;
-if (args.include && args.include !== true) include = new Set((Array.isArray(args.include) ? args.include : [args.include]).map(item => item.split(",")).flat());
-if (args.exclude && args.exclude !== true) exclude = new Set((Array.isArray(args.exclude) ? args.exclude : [args.exclude]).map(item => item.split(",")).flat());
+if (args.include && args.include !== true) include = new Set(flat((Array.isArray(args.include) ? args.include : [args.include]).map(item => item.split(","))));
+if (args.exclude && args.exclude !== true) exclude = new Set(flat((Array.isArray(args.exclude) ? args.exclude : [args.exclude]).map(item => item.split(","))));
 
 function canInclude(name) {
   if (exclude && exclude.has(name)) return false;