diff --git a/testing/tests/regression-suite/808-Spec-UNLOCK-1.test b/testing/tests/regression-suite/808-Spec-UNLOCK-1.test
index 1147f216..d60a63b1 100644
--- a/testing/tests/regression-suite/808-Spec-UNLOCK-1.test
+++ b/testing/tests/regression-suite/808-Spec-UNLOCK-1.test
@@ -10,7 +10,6 @@
 TYPE=UNLOCK
 URL=http://mycaldav/caldav.php/user1/home/i1278618276.ics
 
-HEADER=Content-type: text/xml; charset="utf-8"
 HEADER=Lock-Token: <opaquelocktoken:cafefeed-c001-b055-ea75-deadbeef4a11>
 HEAD
 
diff --git a/testing/tests/regression-suite/809-Spec-UNLOCK-1.test b/testing/tests/regression-suite/809-Spec-UNLOCK-1.test
index 0817ac22..c8297f8a 100644
--- a/testing/tests/regression-suite/809-Spec-UNLOCK-1.test
+++ b/testing/tests/regression-suite/809-Spec-UNLOCK-1.test
@@ -10,7 +10,6 @@ SELECT opaquelocktoken FROM locks WHERE dav_name = '/user1/home/i1278618276.ics'
 ENDSQL
 
 HEADER=Lock-Token: <opaquelocktoken:##locktoken##>
-HEADER=Content-type: text/xml; charset="utf-8"
 HEAD
 
 # There is no data for an UNLOCK request
diff --git a/testing/tests/regression-suite/811-Spec-LOCK-1.test b/testing/tests/regression-suite/811-Spec-LOCK-1.test
index ceedeed2..0ee841b2 100644
--- a/testing/tests/regression-suite/811-Spec-LOCK-1.test
+++ b/testing/tests/regression-suite/811-Spec-LOCK-1.test
@@ -18,7 +18,6 @@ ENDSQL
 
 HEADER=Depth: 0
 HEADER=Timeout: Infinite,Second-4100000000
-HEADER=Content-type: text/xml; charset="utf-8"
 HEADER=Lock-Token: <opaquelocktoken:##locktoken##>
 HEAD
 
diff --git a/testing/tests/regression-suite/815-Spec-UNLOCK-1.test b/testing/tests/regression-suite/815-Spec-UNLOCK-1.test
index 03a2353c..fb5f154e 100644
--- a/testing/tests/regression-suite/815-Spec-UNLOCK-1.test
+++ b/testing/tests/regression-suite/815-Spec-UNLOCK-1.test
@@ -5,7 +5,6 @@
 TYPE=UNLOCK
 URL=http://mycaldav/caldav.php/user1/home/
 
-HEADER=Content-type: text/xml; charset="utf-8"
 HEADER=Lock-Token: <opaquelocktoken:cafefeed-c001-b055-ea75-deadbeef4a11>
 HEAD
 
diff --git a/testing/tests/regression-suite/816-Spec-UNLOCK-1.test b/testing/tests/regression-suite/816-Spec-UNLOCK-1.test
index d844197f..2047e5e0 100644
--- a/testing/tests/regression-suite/816-Spec-UNLOCK-1.test
+++ b/testing/tests/regression-suite/816-Spec-UNLOCK-1.test
@@ -10,7 +10,6 @@ SELECT opaquelocktoken FROM locks WHERE dav_name = '/user1/home/'
 ENDSQL
 
 HEADER=Lock-Token: <opaquelocktoken:##locktoken##>
-HEADER=Content-type: text/xml; charset="utf-8"
 HEAD
 
 # There is no data for an UNLOCK request
diff --git a/testing/tests/regression-suite/839-Spec-UNLOCK-1.test b/testing/tests/regression-suite/839-Spec-UNLOCK-1.test
index b40d889f..62601bbf 100644
--- a/testing/tests/regression-suite/839-Spec-UNLOCK-1.test
+++ b/testing/tests/regression-suite/839-Spec-UNLOCK-1.test
@@ -5,7 +5,6 @@
 TYPE=UNLOCK
 URL=http://regression.host/caldav.php/user1/home/i1278618276.ics
 
-HEADER=Content-type: text/xml; charset="utf-8"
 HEADER=Lock-Token: <opaquelocktoken:cafefeed-c001-b055-ea75-deadbeef4a11>
 HEAD