diff --git a/html/includes/forms/component.inc.php b/html/includes/forms/component.inc.php
index 6492bbfb5..1bf9beee6 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 d22874750..d21e84c03 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 168afe561..0e522d5da 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 687d5fd92..fd534aa82 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 d76fd498b..b67af077f 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 f9cac5ba1..01d20a961 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 0808fae9b..5f40511df 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 d7c14af04..bce7048d0 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 d276e373c..452ab2797 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 9c711db36..54b6961c4 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 f792ec520..f17122864 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 03ca70875..9d4b01f70 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 5c0e327a9..054c2e48e 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(