diff --git a/tests/data/test906 b/tests/data/test906
index 5072e9065b..6cf6bedbf5 100644
--- a/tests/data/test906
+++ b/tests/data/test906
@@ -41,6 +41,9 @@ mail body
  <command>
 smtp://%HOSTIP:%SMTPPORT/906 --mail-rcpt recipient@example.com --mail-from sender@example.com -u testuser:testpass -T -
 </command>
+<precheck>
+chkhostname curlhost
+</precheck>
 </client>
 
 #