diff --git a/addons/mass_mailing/views/snippets_themes.xml b/addons/mass_mailing/views/snippets_themes.xml
index 7f114aaf555..19cb90c2731 100644
--- a/addons/mass_mailing/views/snippets_themes.xml
+++ b/addons/mass_mailing/views/snippets_themes.xml
@@ -609,7 +609,7 @@
                                 Use This Promo Code BEFORE 1st of August
                             </p>
                             <p class="o_mail_h_padding text-center">
-                                <span style="line-height: 30px;"><small>CODE: </small></span><strong class="o_code h3">45A9E77DGW8455</strong>
+                                <span style="line-height: 30px;"><small>CODE: </small></span><strong class="o_code h3 oe_unremovable">45A9E77DGW8455</strong>
                             </p>
                             <p class="text-center">
                                 and save $20 on your next order!