diff --git a/.eslintrc.js b/.eslintrc.js
index ce9e190af8..9670ee74a4 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -34,8 +34,6 @@ module.exports = {
     "import/named": "error",
     "prettier/prettier": ["error", { singleQuote: true, trailingComma: "es5" }],
 
-    "flowtype/no-types-missing-file-annotation": "off", // wait for https://github.com/gajus/eslint-plugin-flowtype/issues/248
-
     // overriding recommended rules
     "no-constant-condition": ["error", { checkLoops: false }],
     "no-console": [ "error", { allow: ["log", "warn", "error"] } ],
diff --git a/package.json b/package.json
index 328e29db17..189d880ebb 100644
--- a/package.json
+++ b/package.json
@@ -101,7 +101,7 @@
     "eslint": "^3.10.2",
     "eslint-config-google": "^0.6.0",
     "eslint-config-prettier": "^2.2.0",
-    "eslint-plugin-flowtype": "^2.30.0",
+    "eslint-plugin-flowtype": "^2.34.1",
     "eslint-plugin-import": "^2.6.1",
     "eslint-plugin-prettier": "^2.1.2",
     "eslint-plugin-react": "^6.4.0",
diff --git a/src/profile-logic/range-filters.js b/src/profile-logic/range-filters.js
index 33fcd4ffd7..8c159bc655 100644
--- a/src/profile-logic/range-filters.js
+++ b/src/profile-logic/range-filters.js
@@ -25,7 +25,7 @@ export function stringifyRangeFilters(arrayValue = []) {
     .join('~');
 }
 
-export function getFormattedTimeLength(length: number) {
+export function getFormattedTimeLength(length) {
   if (length >= 10000) {
     return `${(length / 1000).toFixed(0)} sec`;
   }
diff --git a/src/profile-logic/symbolication.js b/src/profile-logic/symbolication.js
index 17f93b773a..8c9f4fda2e 100644
--- a/src/profile-logic/symbolication.js
+++ b/src/profile-logic/symbolication.js
@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+/* eslint-disable flowtype/no-types-missing-file-annotation */
+
 import bisection from 'bisection';
 import { resourceTypes } from './profile-data';
 import type { Thread, IndexIntoFuncTable } from '../types/profile';
diff --git a/src/test/fixtures/example-symbol-table.js b/src/test/fixtures/example-symbol-table.js
index 7328530a0d..6366b02be0 100644
--- a/src/test/fixtures/example-symbol-table.js
+++ b/src/test/fixtures/example-symbol-table.js
@@ -2,6 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+// @flow
+
 import { TextEncoder } from 'text-encoding';
 import type { SymbolTableAsTuple } from '../../profile-logic/symbol-store-db';
 
diff --git a/src/types/indexeddb.js b/src/types/indexeddb.js
index 12ea3bf8ec..0982af2cb7 100644
--- a/src/types/indexeddb.js
+++ b/src/types/indexeddb.js
@@ -5,6 +5,8 @@
 // Fixed the interfaces, especially added some genericity,
 // and changed so that it can be simply `import`ed.
 
+// @flow
+
 // Implemented by window & worker
 export interface IDBEnvironment {
   indexedDB: IDBFactory,
diff --git a/yarn.lock b/yarn.lock
index f413fabc46..6268790590 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2277,7 +2277,7 @@ eslint-module-utils@^2.0.0:
     debug "^2.6.8"
     pkg-dir "^1.0.0"
 
-eslint-plugin-flowtype@^2.30.0:
+eslint-plugin-flowtype@^2.34.1:
   version "2.34.1"
   resolved "https://registry.yarnpkg.com/eslint-plugin-flowtype/-/eslint-plugin-flowtype-2.34.1.tgz#ea109175645b05d37baeac53b9b65066d79b9446"
   dependencies: