diff --git a/lib/commands/cache.js b/lib/commands/cache.js
index 43f52e4e95e68..587bcbe84ff5d 100644
--- a/lib/commands/cache.js
+++ b/lib/commands/cache.js
@@ -116,7 +116,7 @@ class Cache extends BaseCommand {
       case 'ls':
         return await this.ls(args)
       default:
-        throw Object.assign(new Error(this.usage), { code: 'EUSAGE' })
+        throw this.usageError(this.usage)
     }
   }
 
@@ -168,7 +168,7 @@ class Cache extends BaseCommand {
       '    npm cache add <folder>...\n'
     log.silly('cache add', 'args', args)
     if (args.length === 0)
-      throw Object.assign(new Error(usage), { code: 'EUSAGE' })
+      throw this.usageError(usage)
 
     return Promise.all(args.map(spec => {
       log.silly('cache add', 'spec', spec)