diff --git a/tests/data/test165 b/tests/data/test165
index a3f2c8c0b8..0475b69037 100644
--- a/tests/data/test165
+++ b/tests/data/test165
@@ -21,7 +21,7 @@ http
 idn
 </features>
 <setenv>
-CHARSET=ISO-8859-1
+CHARSET=ISO8859-1
 </setenv>
  <name>
 HTTP over proxy with IDN host name