diff --git a/src/panel/slash-commands.ts b/src/panel/slash-commands.ts
index 3eec6a26..71bfe13a 100644
--- a/src/panel/slash-commands.ts
+++ b/src/panel/slash-commands.ts
@@ -53,7 +53,7 @@ export async function executeSlashCommand(
   command: SlashCommandName,
   args: string,
   context: SlashCommandExecutionContext,
-): Promise<SlashCommandExecutionResult | void> {
+): Promise<SlashCommandExecutionResult | undefined> {
   if (command === "new") {
     await context.startNewThread();
     if (args) return { sendText: args };
diff --git a/src/panel/view.ts b/src/panel/view.ts
index 19cd5ef8..fa94fbab 100644
--- a/src/panel/view.ts
+++ b/src/panel/view.ts
@@ -548,7 +548,7 @@ export class CodexPanelView extends ItemView {
     await this.sendMessage();
   }
 
-  private async executeSlashCommand(command: SlashCommandName, args: string): Promise<SlashCommandExecutionResult | void> {
+  private async executeSlashCommand(command: SlashCommandName, args: string): Promise<SlashCommandExecutionResult | undefined> {
     if (!this.client) return;
     return runSlashCommand(command, args, {
       activeThreadId: this.state.activeThreadId,