diff --git a/lib/manager/npm/registry.js b/lib/manager/npm/registry.js
index 6dda3d0b544de8ecd34ca1235725bf489a8fa98b..2f69fa90ffaf2feae72605970142a28ac7398221 100644
--- a/lib/manager/npm/registry.js
+++ b/lib/manager/npm/registry.js
@@ -7,7 +7,8 @@ const registryAuthToken = require('registry-auth-token');
 const parse = require('github-url-from-git');
 const os = require('os');
 const fetch = require('make-fetch-happen').defaults({
-  cacheManager: (process.env.TMPDIR || os.tmpdir()) + '/renovate-npm-cache',
+  cacheManager:
+    (process.env.RENOVATE_TMPDIR || os.tmpdir()) + '/renovate-npm-cache',
 });
 
 module.exports = {
diff --git a/lib/workers/pr/changelog.js b/lib/workers/pr/changelog.js
index 2a41e823a87904fcfc7deb0cd5851ecd4a1b41c8..fb66ed98566857d2411271b5155c484317c2f048 100644
--- a/lib/workers/pr/changelog.js
+++ b/lib/workers/pr/changelog.js
@@ -12,7 +12,7 @@ async function getChangeLogJSON(depName, fromVersion, newVersion) {
     return null;
   }
   const cachePath =
-    (process.env.TMPDIR || os.tmpdir()) + '/renovate-changelog-cache';
+    (process.env.RENOVATE_TMPDIR || os.tmpdir()) + '/renovate-changelog-cache';
   const cacheKey = `${depName}-${fromVersion}-${newVersion}`;
 
   // Return from cache if present