diff --git a/html/includes/forms/component.inc.php b/html/includes/forms/component.inc.php
index 6492bbfb5b..1bf9beee6f 100644
--- a/html/includes/forms/component.inc.php
+++ b/html/includes/forms/component.inc.php
@@ -1,4 +1,5 @@
 <?php
+header('Content-type: application/json');
 
 if (is_admin() === false) {
     $response = array(
diff --git a/html/includes/forms/delete-device-group.inc.php b/html/includes/forms/delete-device-group.inc.php
index d22874750b..d21e84c03a 100644
--- a/html/includes/forms/delete-device-group.inc.php
+++ b/html/includes/forms/delete-device-group.inc.php
@@ -11,6 +11,7 @@
  * option) any later version.  Please see LICENSE.txt at the top level of
  * the source code distribution for details.
  */
+header('Content-type: text/plain');
 
 if (is_admin() === false) {
     die('ERROR: You need to be admin');
diff --git a/html/includes/forms/discovery-module-update.inc.php b/html/includes/forms/discovery-module-update.inc.php
index 168afe561e..0e522d5da6 100644
--- a/html/includes/forms/discovery-module-update.inc.php
+++ b/html/includes/forms/discovery-module-update.inc.php
@@ -1,4 +1,5 @@
 <?php
+header('Content-type: text/plain');
 
 // FUA
 
diff --git a/html/includes/forms/health-update.inc.php b/html/includes/forms/health-update.inc.php
index 687d5fd925..fd534aa824 100644
--- a/html/includes/forms/health-update.inc.php
+++ b/html/includes/forms/health-update.inc.php
@@ -11,6 +11,7 @@
  * option) any later version.  Please see LICENSE.txt at the top level of
  * the source code distribution for details.
  */
+header('Content-type: text/plain');
 
 // FUA
 
diff --git a/html/includes/forms/parse-device-group.inc.php b/html/includes/forms/parse-device-group.inc.php
index d76fd498bb..b67af077f1 100644
--- a/html/includes/forms/parse-device-group.inc.php
+++ b/html/includes/forms/parse-device-group.inc.php
@@ -11,6 +11,7 @@
  * option) any later version.  Please see LICENSE.txt at the top level of
  * the source code distribution for details.
  */
+header('Content-type: application/json');
 
 if (is_admin() === false) {
     die('ERROR: You need to be admin');
diff --git a/html/includes/forms/parse-poller-groups.inc.php b/html/includes/forms/parse-poller-groups.inc.php
index f9cac5ba1d..01d20a9612 100644
--- a/html/includes/forms/parse-poller-groups.inc.php
+++ b/html/includes/forms/parse-poller-groups.inc.php
@@ -11,6 +11,7 @@
  * option) any later version.  Please see LICENSE.txt at the top level of
  * the source code distribution for details.
  */
+header('Content-type: application/json');
 
 if (is_admin() === false) {
     die('ERROR: You need to be admin');
diff --git a/html/includes/forms/poller-group-remove.inc.php b/html/includes/forms/poller-group-remove.inc.php
index 0808fae9b9..5f40511dfa 100644
--- a/html/includes/forms/poller-group-remove.inc.php
+++ b/html/includes/forms/poller-group-remove.inc.php
@@ -11,6 +11,7 @@
  * option) any later version.  Please see LICENSE.txt at the top level of
  * the source code distribution for details.
  */
+header('Content-type: text/plain');
 
 if(is_admin() === false) {
     die('ERROR: You need to be admin');
diff --git a/html/includes/forms/poller-groups.inc.php b/html/includes/forms/poller-groups.inc.php
index d7c14af04f..bce7048d04 100644
--- a/html/includes/forms/poller-groups.inc.php
+++ b/html/includes/forms/poller-groups.inc.php
@@ -11,6 +11,7 @@
  * option) any later version.  Please see LICENSE.txt at the top level of
  * the source code distribution for details.
  */
+header('Content-type: text/plain');
 
 if (is_admin() === false) {
     die('ERROR: You need to be admin');
diff --git a/html/includes/forms/poller-module-update.inc.php b/html/includes/forms/poller-module-update.inc.php
index d276e373c1..452ab27975 100644
--- a/html/includes/forms/poller-module-update.inc.php
+++ b/html/includes/forms/poller-module-update.inc.php
@@ -1,4 +1,5 @@
 <?php
+header('Content-type: text/plain');
 
 if(is_admin() === false) {
     die('ERROR: You need to be admin');
diff --git a/html/includes/forms/storage-update.inc.php b/html/includes/forms/storage-update.inc.php
index 9c711db366..54b6961c49 100644
--- a/html/includes/forms/storage-update.inc.php
+++ b/html/includes/forms/storage-update.inc.php
@@ -11,6 +11,7 @@
  * option) any later version.  Please see LICENSE.txt at the top level of
  * the source code distribution for details.
  */
+header('Content-type: application/json');
 
 if (is_admin() === false) {
     $response = array(
diff --git a/html/includes/forms/update-ifalias.inc.php b/html/includes/forms/update-ifalias.inc.php
index f792ec5206..f17122864d 100644
--- a/html/includes/forms/update-ifalias.inc.php
+++ b/html/includes/forms/update-ifalias.inc.php
@@ -11,6 +11,7 @@
  * option) any later version.  Please see LICENSE.txt at the top level of
  * the source code distribution for details.
 */
+header('Content-type: application/json');
 
 $status  = 'error';
 
diff --git a/html/includes/forms/update-port-notes.inc.php b/html/includes/forms/update-port-notes.inc.php
index 03ca708751..9d4b01f700 100644
--- a/html/includes/forms/update-port-notes.inc.php
+++ b/html/includes/forms/update-port-notes.inc.php
@@ -9,6 +9,7 @@
  * option) any later version.  Please see LICENSE.txt at the top level of
  * the source code distribution for details.
  */
+header('Content-type: application/json');
 
 $status    = 'error';
 $message   = 'unknown error';
diff --git a/html/includes/forms/update-ports.inc.php b/html/includes/forms/update-ports.inc.php
index 5c0e327a91..054c2e48ea 100644
--- a/html/includes/forms/update-ports.inc.php
+++ b/html/includes/forms/update-ports.inc.php
@@ -1,4 +1,5 @@
 <?php
+header('Content-type: application/json');
 
 if (is_admin() === false) {
     $response = array(