diff --git a/packages/jest-util/package.json b/packages/jest-util/package.json
index 476c0208dbff..204112225adf 100644
--- a/packages/jest-util/package.json
+++ b/packages/jest-util/package.json
@@ -12,8 +12,10 @@
     "chalk": "^2.0.1",
     "graceful-fs": "^4.1.11",
     "jest-message-util": "^21.2.1",
-    "jest-mock": "^21.2.0",
     "jest-validate": "^21.2.1",
     "mkdirp": "^0.5.1"
+  },
+  "devDependencies": {
+    "jest-mock": "^21.2.0"
   }
 }
diff --git a/packages/jest-util/src/fake_timers.js b/packages/jest-util/src/fake_timers.js
index 4cc562339695..0633a3fa0640 100644
--- a/packages/jest-util/src/fake_timers.js
+++ b/packages/jest-util/src/fake_timers.js
@@ -9,7 +9,7 @@
 
 import type {ProjectConfig} from 'types/Config';
 import type {Global} from 'types/Global';
-import type {ModuleMocker} from 'jest-mock';
+import type {ModuleMocker} from 'types/Mock';
 
 import {formatStackTrace} from 'jest-message-util';
 import setGlobal from './set_global';