diff --git a/lib/Newsletter/Renderer/Preprocessor.php b/lib/Newsletter/Renderer/Preprocessor.php
index a4ae8fa7a9..cc954188af 100644
--- a/lib/Newsletter/Renderer/Preprocessor.php
+++ b/lib/Newsletter/Renderer/Preprocessor.php
@@ -7,8 +7,8 @@ use MailPoet\Newsletter\Renderer\Blocks\Renderer as BlocksRenderer;
 use MailPoet\WooCommerce\TransactionalEmails;
 
 class Preprocessor {
-  const WC_HEADING_PLACEHOLDER = '[mailpet_woocommerce_heading_placeholder]';
-  const WC_CONTENT_PLACEHOLDER = '[mailpet_woocommerce_content_placeholder]';
+  const WC_HEADING_PLACEHOLDER = '[mailpoet_woocommerce_heading_placeholder]';
+  const WC_CONTENT_PLACEHOLDER = '[mailpoet_woocommerce_content_placeholder]';
 
   const WC_HEADING_BEFORE = '
     <table width="100%" border="0" cellpadding="0" cellspacing="0" style="border-spacing:0;mso-table-lspace:0;mso-table-rspace:0">
diff --git a/tests/unit/Newsletter/Renderer/PreprocessorTest.php b/tests/unit/Newsletter/Renderer/PreprocessorTest.php
index 6ebda22fb9..e934516083 100644
--- a/tests/unit/Newsletter/Renderer/PreprocessorTest.php
+++ b/tests/unit/Newsletter/Renderer/PreprocessorTest.php
@@ -31,7 +31,7 @@ class PreprocessorTest extends \MailPoetUnitTest {
           'blocks' => [
             [
               'type' => 'text',
-              'text' => Preprocessor::WC_HEADING_BEFORE . '<h1 style="color:{base_text_color};">[mailpet_woocommerce_heading_placeholder]</h1>' . Preprocessor::WC_HEADING_AFTER,
+              'text' => Preprocessor::WC_HEADING_BEFORE . '<h1 style="color:{base_text_color};">[mailpoet_woocommerce_heading_placeholder]</h1>' . Preprocessor::WC_HEADING_AFTER,
             ],
           ],
         ],
@@ -56,7 +56,7 @@ class PreprocessorTest extends \MailPoetUnitTest {
           'blocks' => [
             [
               'type' => 'text',
-              'text' => '[mailpet_woocommerce_content_placeholder]',
+              'text' => '[mailpoet_woocommerce_content_placeholder]',
             ],
           ],
         ],