diff --git a/packages/discord.js/src/client/BaseClient.js b/packages/discord.js/src/client/BaseClient.js
index 8df5e549de3c..d9473c4a9e45 100644
--- a/packages/discord.js/src/client/BaseClient.js
+++ b/packages/discord.js/src/client/BaseClient.js
@@ -44,7 +44,7 @@ class BaseClient extends EventEmitter {
         ...options.rest,
         userAgentAppendix: options.rest?.userAgentAppendix
           ? `${Options.userAgentAppendix} ${options.rest.userAgentAppendix}`
-          : undefined,
+          : Options.userAgentAppendix,
       },
     };