diff --git a/frontend/apps/remark42/app/__mocks__/resize-observer.ts b/frontend/apps/remark42/app/__mocks__/resize-observer.ts
new file mode 100644
index 0000000000..bdee163b56
--- /dev/null
+++ b/frontend/apps/remark42/app/__mocks__/resize-observer.ts
@@ -0,0 +1,11 @@
+global.ResizeObserver = class ResizeObserver {
+  observe() {
+    // do nothing
+  }
+  unobserve() {
+    // do nothing
+  }
+  disconnect() {
+    // do nothing
+  }
+};
diff --git a/frontend/apps/remark42/jest.config.ts b/frontend/apps/remark42/jest.config.ts
index ad822e48a7..4d9f28a94c 100644
--- a/frontend/apps/remark42/jest.config.ts
+++ b/frontend/apps/remark42/jest.config.ts
@@ -33,6 +33,7 @@ const config: Config = {
   setupFilesAfterEnv: [
     '<rootDir>/app/__mocks__/fetch.ts',
     '<rootDir>/app/__mocks__/localstorage.ts',
+    '<rootDir>/app/__mocks__/resize-observer.ts',
     '<rootDir>/app/__stubs__/remark-config.ts',
     '<rootDir>/app/__stubs__/static-config.ts',
   ],