diff --git a/inc/tz/get.php b/inc/tz/get.php
index 029a6b9b..6cc8b596 100644
--- a/inc/tz/get.php
+++ b/inc/tz/get.php
@@ -13,7 +13,7 @@ require_once('vCalendar.php');
 
 if ( empty($format) ) $format = 'text/calendar';
 if ( $format != 'text/calendar' ) {
-  $request->PreconditionFailed(403, $precondition);
+  $request->PreconditionFailed(403, 'supported-format', 'This server currently only supports text/calendar format.');
 }
 
 $sql = 'SELECT our_tzno, tzid, active, olson_name, vtimezone, etag, ';
diff --git a/testing/tests/timezone/5032-get.result b/testing/tests/timezone/5032-get.result
new file mode 100644
index 00000000..41997ac0
--- /dev/null
+++ b/testing/tests/timezone/5032-get.result
@@ -0,0 +1,9 @@
+HTTP/1.1 403 Forbidden
+Date: Dow, 01 Jan 2000 00:00:00 GMT
+Content-Length: 148
+Content-Type: text/xml; charset="utf-8"
+
+<?xml version="1.0" encoding="utf-8" ?>
+<error xmlns="DAV:">
+  <supported-format/>This server currently only supports text/calendar format.
+</error>
\ No newline at end of file
diff --git a/testing/tests/timezone/5032-get.test b/testing/tests/timezone/5032-get.test
new file mode 100644
index 00000000..590a71dc
--- /dev/null
+++ b/testing/tests/timezone/5032-get.test
@@ -0,0 +1,8 @@
+#
+# List timezone server timezones
+#
+TYPE=GET
+URL=http://regression.host/tz.php?action=get&tzid=Europe/London&lang=en_UK&format=application/calendar+xml
+HEAD
+
+REPLACE=/LAST-MODIFIED:[0-9TZ]{16}/LAST-MODIFIED:all good/