diff --git a/lib/Subscribers/ImportExport/Export/Export.php b/lib/Subscribers/ImportExport/Export/Export.php
index b2da493576..2250a3b4ad 100644
--- a/lib/Subscribers/ImportExport/Export/Export.php
+++ b/lib/Subscribers/ImportExport/Export/Export.php
@@ -8,6 +8,7 @@ use MailPoet\Models\Subscriber;
 use MailPoet\Models\SubscriberSegment;
 use MailPoet\Subscribers\ImportExport\ImportExportFactory;
 use MailPoet\Util\Helpers;
+use MailPoet\Util\Security;
 use MailPoet\Util\XLSXWriter;
 
 class Export {
@@ -240,7 +241,7 @@ class Export {
   function getExportFile($format) {
     return sprintf(
       $this->export_path . '/MailPoet_export_%s.%s',
-      substr(md5(time()), 0, 4),
+      Security::generateRandomString(15),
       $format
     );
   }
diff --git a/tests/unit/Subscribers/ImportExport/Export/ExportTest.php b/tests/unit/Subscribers/ImportExport/Export/ExportTest.php
index 3c33687bdb..e70f082f10 100644
--- a/tests/unit/Subscribers/ImportExport/Export/ExportTest.php
+++ b/tests/unit/Subscribers/ImportExport/Export/ExportTest.php
@@ -134,7 +134,7 @@ class ExportTest extends MailPoetTest {
     expect(
       preg_match(
         '|' .
-        Env::$temp_path . '/MailPoet_export_[a-f0-9]{4}.' .
+        Env::$temp_path . '/MailPoet_export_[a-f0-9]{15}.' .
         $this->export->export_format_option .
         '|', $this->export->export_file)
     )->equals(1);