diff --git a/lib/context/CommandContextBuilder.js b/lib/context/CommandContextBuilder.js
index 8669956..41c7857 100644
--- a/lib/context/CommandContextBuilder.js
+++ b/lib/context/CommandContextBuilder.js
@@ -4,7 +4,7 @@ const CommandContext = require('./CommandContext.js')
 const SuggestionContext = require('./SuggestionContext.js')
 
 class CommandContextBuilder {
-  arguments = {}
+  arguments = Object.create(null)
   nodes = []
   modifier = null
   forks = false
diff --git a/lib/tree/CommandNode.js b/lib/tree/CommandNode.js
index 45a8807..ee38cb9 100644
--- a/lib/tree/CommandNode.js
+++ b/lib/tree/CommandNode.js
@@ -1,9 +1,9 @@
 let ArgumentCommandNode, LiteralCommandNode, RootCommandNode
 
 class CommandNode {
-  children = {}
-  literals = {}
-  arguments = {}
+  children = Object.create(null)
+  literals = Object.create(null)
+  arguments = Object.create(null)
 
   constructor ({ command, requirement, redirect, modifier, forks = false }) {
     this.command = command