diff --git a/src/vs/workbench/contrib/chat/browser/chat.ts b/src/vs/workbench/contrib/chat/browser/chat.ts
index 15318bd0e4576..47540018a2de9 100644
--- a/src/vs/workbench/contrib/chat/browser/chat.ts
+++ b/src/vs/workbench/contrib/chat/browser/chat.ts
@@ -60,8 +60,8 @@ export function ensureSideBarChatViewSize(viewDescriptorService: IViewDescriptor
 
 	const viewPart = location === ViewContainerLocation.Sidebar ? Parts.SIDEBAR_PART : Parts.AUXILIARYBAR_PART;
 	const partSize = layoutService.getSize(viewPart);
-	if (partSize.width < 300) {
-		layoutService.setSize(viewPart, { width: 300, height: partSize.height });
+	if (partSize.width < 400) {
+		layoutService.setSize(viewPart, { width: 400, height: partSize.height });
 	}
 }