diff --git a/xwiki-platform-core/xwiki-platform-administration/xwiki-platform-administration-test/xwiki-platform-administration-test-docker/src/test/it/org/xwiki/administration/test/ui/RegisterIT.java b/xwiki-platform-core/xwiki-platform-administration/xwiki-platform-administration-test/xwiki-platform-administration-test-docker/src/test/it/org/xwiki/administration/test/ui/RegisterIT.java
index be9b7165de35..9aef8a22fd7a 100644
--- a/xwiki-platform-core/xwiki-platform-administration/xwiki-platform-administration-test/xwiki-platform-administration-test-docker/src/test/it/org/xwiki/administration/test/ui/RegisterIT.java
+++ b/xwiki-platform-core/xwiki-platform-administration/xwiki-platform-administration-test/xwiki-platform-administration-test-docker/src/test/it/org/xwiki/administration/test/ui/RegisterIT.java
@@ -346,7 +346,10 @@ void registerWikiSyntaxName(boolean isModal, boolean closedWiki, boolean withReg
             assertTrue(validateAndRegister(testUtils, isModal, registrationPage), String.format("isModal: %s close "
                 + "wiki: %s withRegistrationConfig: %s", isModal, closedWiki, withRegistrationConfig));
 
-            assertEquals(String.format("%s %s (%s): Registration successful.", firstName, lastName,
+            // TODO: looks like a pretty strange behavior, there might be a message box title missing somewhere
+            String messagePrefix = closedWiki ? "" : "Info ";
+
+            assertEquals(String.format("%s%s %s (%s): Registration successful.", messagePrefix, firstName, lastName,
                     AbstractRegistrationPage.JOHN_SMITH_USERNAME),
                 ((RegistrationPage) registrationPage).getRegistrationSuccessMessage().orElseThrow());
         }