diff --git a/apps/web/playwright/e2e/threads/threads.spec.ts b/apps/web/playwright/e2e/threads/threads.spec.ts
index b2c1879350..520d22bf90 100644
--- a/apps/web/playwright/e2e/threads/threads.spec.ts
+++ b/apps/web/playwright/e2e/threads/threads.spec.ts
@@ -595,4 +595,49 @@ test.describe("Threads", () => {
             rightPanel.locator(".mx_EventTile").getByText("Hello again Mr. User in a thread"),
         ).not.toBeVisible();
     });
+
+    test("should have a header the same height as the pinned message banner", async ({ page, app, user }) => {
+        // Create room
+        const roomId = await app.client.createRoom({});
+        await page.goto("/#/room/" + roomId);
+
+        // Send a message and pin it, so the pinned message banner is shown
+        const roomViewBody = page.locator(".mx_RoomView_body");
+        const textbox = roomViewBody.getByRole("textbox", { name: "Send an unencrypted message…" });
+        await textbox.fill("Hello Mr. Bot");
+        await textbox.press("Enter");
+
+        const message = roomViewBody.locator(".mx_MTextBody").filter({ hasText: "Hello Mr. Bot" });
+        await message.click({ button: "right" });
+        await page.getByRole("menuitem", { name: "Pin", exact: true }).click();
+
+        const pinnedMessageBanner = page.getByTestId("pinned-message-banner");
+        await expect(pinnedMessageBanner).toBeVisible();
+
+        // Reply in a thread, so the Threads panel header (Mark all as read + Show filter) is shown
+        const messageTile = roomViewBody
+            .locator(".mx_EventTile[data-scroll-tokens]")
+            .filter({ hasText: "Hello Mr. Bot" });
+        await messageTile.hover();
+        await messageTile.getByRole("button", { name: "Reply in thread" }).click();
+        await expect(page.locator(".mx_ThreadView_timelinePanelWrapper")).toHaveCount(1);
+
+        const threadPanel = page.locator(".mx_ThreadPanel");
+        const threadTextbox = threadPanel.getByRole("textbox", { name: "Send an unencrypted message…" });
+        await threadTextbox.fill("Hello Mr. User in a thread");
+        await threadTextbox.press("Enter");
+        await expect(threadPanel.locator(".mx_EventTile_last").getByText("Hello Mr. User in a thread")).toBeVisible();
+        await threadPanel.getByTestId("base-card-close-button").click();
+
+        await page.locator(".mx_RoomHeader").getByRole("button", { name: "Threads" }).click();
+        const threadPanelHeader = page.locator(".mx_ThreadPanelHeader");
+        await expect(threadPanelHeader).toBeVisible();
+
+        // The two containers must be the same height so their bottom borders line up
+        // See https://github.com/element-hq/element-web/issues/34463
+        const pinnedBannerBox = await pinnedMessageBanner.boundingBox();
+        const threadHeaderBox = await threadPanelHeader.boundingBox();
+        expect(threadHeaderBox?.height).toBe(pinnedBannerBox?.height);
+        await expect(threadPanelHeader).toHaveCSS("height", "64px");
+    });
 });
diff --git a/apps/web/playwright/snapshots/threads/threads.spec.ts/thread-panel-linux.png b/apps/web/playwright/snapshots/threads/threads.spec.ts/thread-panel-linux.png
index c42007680d..ecc634cc5c 100644
Binary files a/apps/web/playwright/snapshots/threads/threads.spec.ts/thread-panel-linux.png and b/apps/web/playwright/snapshots/threads/threads.spec.ts/thread-panel-linux.png differ
diff --git a/apps/web/res/css/views/right_panel/_ThreadPanel.pcss b/apps/web/res/css/views/right_panel/_ThreadPanel.pcss
index d17b105f3e..85e3217c2e 100644
--- a/apps/web/res/css/views/right_panel/_ThreadPanel.pcss
+++ b/apps/web/res/css/views/right_panel/_ThreadPanel.pcss
@@ -11,7 +11,7 @@ Please see LICENSE files in the repository root for full details.
     overflow: visible;
 
     .mx_ThreadPanelHeader {
-        height: 60px;
+        height: 64px;
         display: flex;
         box-sizing: border-box;
         padding: 16px;