diff --git a/frontend/src/components/AgentPanel.test.tsx b/frontend/src/components/AgentPanel.test.tsx
index a388a80..bb404e1 100644
--- a/frontend/src/components/AgentPanel.test.tsx
+++ b/frontend/src/components/AgentPanel.test.tsx
@@ -1,4 +1,4 @@
-import { render, screen, waitFor } from "@testing-library/react";
+import { act, render, screen, waitFor } from "@testing-library/react";
 import userEvent from "@testing-library/user-event";
 import {
 	afterEach,
@@ -345,26 +345,32 @@ describe("AgentPanel fade-out", () => {
 
 			const { container } = render(<AgentPanel />);
 
-			// Wait for the agent entry to appear
-			await waitFor(() => {
-				expect(
-					container.querySelector(
-						'[data-testid="agent-entry-73_remove_test:coder-1"]',
-					),
-				).toBeInTheDocument();
+			// With fake timers active, waitFor's polling setInterval never fires.
+			// Use act to flush pending promises and React state updates instead.
+			await act(async () => {
+				await Promise.resolve();
+				await Promise.resolve();
+				await Promise.resolve();
+				await Promise.resolve();
 			});
 
-			// Advance timers by 60 seconds
-			vi.advanceTimersByTime(60_000);
+			expect(
+				container.querySelector(
+					'[data-testid="agent-entry-73_remove_test:coder-1"]',
+				),
+			).toBeInTheDocument();
+
+			// Advance fake timers by 60 seconds inside act to flush React state updates
+			await act(async () => {
+				vi.advanceTimersByTime(60_000);
+			});
 
 			// Entry should be removed
-			await waitFor(() => {
-				expect(
-					container.querySelector(
-						'[data-testid="agent-entry-73_remove_test:coder-1"]',
-					),
-				).not.toBeInTheDocument();
-			});
+			expect(
+				container.querySelector(
+					'[data-testid="agent-entry-73_remove_test:coder-1"]',
+				),
+			).not.toBeInTheDocument();
 		});
 	});
 });