diff --git a/src/node.cc b/src/node.cc
index 78a72e3263016b..37d4309aa0c39a 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -3692,7 +3692,7 @@ static void ParseArgs(int* argc,
 #endif /* HAVE_OPENSSL */
 #if defined(NODE_HAVE_I18N_SUPPORT)
     } else if (strncmp(arg, "--icu-data-dir=", 15) == 0) {
-      icu_data_dir.assign(arg, 15);
+      icu_data_dir.assign(arg + 15);
 #endif
     } else if (strcmp(arg, "--expose-internals") == 0 ||
                strcmp(arg, "--expose_internals") == 0) {
diff --git a/test/parallel/test-intl-no-icu-data.js b/test/parallel/test-intl-no-icu-data.js
index dd14c146719fb1..ce5e9a08121cdc 100644
--- a/test/parallel/test-intl-no-icu-data.js
+++ b/test/parallel/test-intl-no-icu-data.js
@@ -2,6 +2,8 @@
 'use strict';
 require('../common');
 const assert = require('assert');
+const config = process.binding('config');
 
 // No-op when ICU case mappings are unavailable.
 assert.strictEqual('ç'.toLocaleUpperCase('el'), 'ç');
+assert.strictEqual(config.icuDataDir, 'test/fixtures/empty/');