diff --git a/CHANGELOG.md b/CHANGELOG.md
index e22ba166b0c5..ce99244c2394 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,8 @@
 ## Changelog
+##### 2.6.11 [LEGACY] - 2019.12.09
+- Returned usage of `node -e` in `postinstall` scripts for better cross-platform compatibility, [#582](https://github.com/zloirock/core-js/issues/582)
+- Improved CI detection in the `postinstall` script, [#707](https://github.com/zloirock/core-js/issues/707)
+
 ##### 2.6.10 [LEGACY] - 2019.10.13
 - Show similar `postinstall` messages only once per `npm i`, [#597](https://github.com/zloirock/core-js/issues/597)
 
diff --git a/package.json b/package.json
index 400942affa6f..533b323a4b7d 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,7 @@
     "promises-tests": "promises-aplus-tests tests/promises-aplus/adapter",
     "observables-tests": "node tests/observables/adapter && node tests/observables/adapter-library",
     "test": "npm run grunt clean copy && npm run lint && npm run grunt livescript client karma:default && npm run grunt library karma:library && npm run promises-tests && npm run observables-tests && lsc tests/commonjs",
-    "postinstall": "node postinstall || echo \"ignore\""
+    "postinstall": "node -e \"try{require('./postinstall')}catch(e){}\""
   },
   "license": "MIT",
   "keywords": [
diff --git a/postinstall.js b/postinstall.js
index d13423937ca2..fcb8d3cb5b93 100644
--- a/postinstall.js
+++ b/postinstall.js
@@ -5,12 +5,19 @@ var path = require('path');
 var env = process.env;
 
 var ADBLOCK = is(env.ADBLOCK);
-var CI = is(env.CI);
 var COLOR = is(env.npm_config_color);
 var DISABLE_OPENCOLLECTIVE = is(env.DISABLE_OPENCOLLECTIVE);
 var SILENT = ['silent', 'error', 'warn'].indexOf(env.npm_config_loglevel) !== -1;
 var MINUTE = 60 * 1000;
 
+// you could add a PR with an env variable for your CI detection
+var CI = [
+  'BUILD_NUMBER',
+  'CI',
+  'CONTINUOUS_INTEGRATION',
+  'RUN_ID'
+].some(function (it) { return is(env[it]); });
+
 var BANNER = '\u001B[96mThank you for using core-js (\u001B[94m https://github.com/zloirock/core-js \u001B[96m) for polyfilling JavaScript standard library!\u001B[0m\n\n' +
              '\u001B[96mThe project needs your help! Please consider supporting of core-js on Open Collective or Patreon: \u001B[0m\n' +
              '\u001B[96m>\u001B[94m https://opencollective.com/core-js \u001B[0m\n' +