diff --git a/lib/command.js b/lib/command.js
index e014d957f..ca4a45ecb 100644
--- a/lib/command.js
+++ b/lib/command.js
@@ -77,6 +77,9 @@ class Command extends EventEmitter {
     this._helpCommandnameAndArgs = 'help [command]';
     this._helpCommandDescription = 'display help for command';
     this._helpConfiguration = {};
+
+    this._version = undefined;
+    this._versionOptionName = undefined;
   }
 
   /**