diff --git a/modules/spamfilter/tpl/filter/insert_denied_word.xml b/modules/spamfilter/tpl/filter/insert_denied_word.xml
index b6067f9c8..059318a8c 100644
--- a/modules/spamfilter/tpl/filter/insert_denied_word.xml
+++ b/modules/spamfilter/tpl/filter/insert_denied_word.xml
@@ -1,6 +1,6 @@
 <filter name="insert_denied_word" module="spamfilter" act="procSpamfilterAdminInsertDeniedWord" confirm_msg_code="confirm_submit">
   <form>
-    <node target="word" required="true" minlength="4" maxlength="250" />
+    <node target="word" required="true" minlength="1" maxlength="250" />
   </form>
   <parameter>
     <param param="word" target="word" />