diff --git a/conf/dialplan/default.xml b/conf/dialplan/default.xml
index f03fdad84e..a609581b90 100644
--- a/conf/dialplan/default.xml
+++ b/conf/dialplan/default.xml
@@ -178,7 +178,7 @@
     </extension>
 
     <extension name="eavesdrop">
-      <condition field="destination_number" expression="^88(.*)$|^\*0(.*)$">
+      <condition field="destination_number" expression="^88(\d{4})$|^\*0(.*)$">
 	<action application="answer"/>
 	<action application="eavesdrop" data="${hash(select/${domain_name}-spymap/$1)}"/>
       </condition>