diff --git a/src/Document.tsx b/src/Document.tsx
index 67099e53a..db7d8acd7 100644
--- a/src/Document.tsx
+++ b/src/Document.tsx
@@ -1,3 +1,5 @@
+'use client';
+
 /**
  * Loads a PDF document. Passes it to all children.
  */
diff --git a/src/DocumentContext.tsx b/src/DocumentContext.tsx
index b4caaab73..e1d22ba61 100644
--- a/src/DocumentContext.tsx
+++ b/src/DocumentContext.tsx
@@ -1,3 +1,5 @@
+'use client';
+
 import { createContext } from 'react';
 
 import type { DocumentContextType } from './shared/types';
diff --git a/src/Outline.tsx b/src/Outline.tsx
index 6fa80229f..00c369add 100644
--- a/src/Outline.tsx
+++ b/src/Outline.tsx
@@ -1,3 +1,5 @@
+'use client';
+
 import React, { useEffect, useMemo } from 'react';
 import PropTypes from 'prop-types';
 import makeCancellable from 'make-cancellable-promise';
diff --git a/src/OutlineContext.tsx b/src/OutlineContext.tsx
index 73b3b9d29..4ccc98459 100644
--- a/src/OutlineContext.tsx
+++ b/src/OutlineContext.tsx
@@ -1,3 +1,5 @@
+'use client';
+
 import { createContext } from 'react';
 
 import type { OutlineContextType } from './shared/types';
diff --git a/src/Page.tsx b/src/Page.tsx
index 0e308b413..21070a48e 100644
--- a/src/Page.tsx
+++ b/src/Page.tsx
@@ -1,3 +1,5 @@
+'use client';
+
 import React, { useEffect, useMemo, useRef } from 'react';
 import PropTypes from 'prop-types';
 import makeCancellable from 'make-cancellable-promise';
diff --git a/src/PageContext.tsx b/src/PageContext.tsx
index 4189e66b2..8548c27c9 100644
--- a/src/PageContext.tsx
+++ b/src/PageContext.tsx
@@ -1,3 +1,5 @@
+'use client';
+
 import { createContext } from 'react';
 
 import type { PageContextType } from './shared/types';
diff --git a/src/Thumbnail.tsx b/src/Thumbnail.tsx
index 47a3b0a84..ba2d725bb 100644
--- a/src/Thumbnail.tsx
+++ b/src/Thumbnail.tsx
@@ -1,3 +1,5 @@
+'use client';
+
 import React from 'react';
 import clsx from 'clsx';
 import invariant from 'tiny-invariant';