diff --git a/src/main/java/org/olat/core/util/filter/impl/_resources/antisamy-tinymce.xml b/src/main/java/org/olat/core/util/filter/impl/_resources/antisamy-tinymce.xml
index edeba7bff46b1d61ef4def6acf99669f15387ccb..7d034891470f5ffc498edc3e7623fb6d16d77550 100644
--- a/src/main/java/org/olat/core/util/filter/impl/_resources/antisamy-tinymce.xml
+++ b/src/main/java/org/olat/core/util/filter/impl/_resources/antisamy-tinymce.xml
@@ -557,7 +557,10 @@
 			<attribute name="charoff" />
 			<attribute name="background" />
 		</tag>
+		
+		<tag name="init" action="validate">
 
+		</tag>
 
 	</tag-rules>