diff --git a/src/components/channelMapper/channelMapper.js b/src/components/channelMapper/channelMapper.js
index e747279693..2cf65e647c 100644
--- a/src/components/channelMapper/channelMapper.js
+++ b/src/components/channelMapper/channelMapper.js
@@ -24,6 +24,7 @@ export default class channelMapper {
                     tunerChannelId: channelId,
                     providerChannelId: providerChannelId
                 }),
+                contentType: 'application/json',
                 dataType: 'json'
             }).then(mapping => {
                 const listItem = dom.parentWithClass(button, 'listItem');
diff --git a/src/components/directorybrowser/directorybrowser.js b/src/components/directorybrowser/directorybrowser.js
index 4205e04a4f..3dd3302b28 100644
--- a/src/components/directorybrowser/directorybrowser.js
+++ b/src/components/directorybrowser/directorybrowser.js
@@ -169,7 +169,8 @@ import 'emby-button';
             data: JSON.stringify({
                 ValidateWriteable: validateWriteable,
                 Path: path
-            })
+            }),
+            contentType: 'application/json'
         }).catch(response => {
             if (response) {
                 if (response.status === 404) {
diff --git a/src/controllers/dashboard/encodingsettings.js b/src/controllers/dashboard/encodingsettings.js
index dfad07618c..df36ffdc6f 100644
--- a/src/controllers/dashboard/encodingsettings.js
+++ b/src/controllers/dashboard/encodingsettings.js
@@ -48,7 +48,8 @@ import libraryMenu from 'libraryMenu';
                 data: JSON.stringify({
                     Path: form.querySelector('.txtEncoderPath').value,
                     PathType: 'Custom'
-                })
+                }),
+                contentType: 'application/json'
             }).then(Dashboard.processServerConfigurationUpdateResult, onSaveEncodingPathFailure);
         });
     }
diff --git a/src/controllers/session/resetPassword/index.js b/src/controllers/session/resetPassword/index.js
index 3cb8d4a9e2..d4f7df5bbd 100644
--- a/src/controllers/session/resetPassword/index.js
+++ b/src/controllers/session/resetPassword/index.js
@@ -31,7 +31,8 @@ import globalize from 'globalize';
                 dataType: 'json',
                 data: JSON.stringify({
                     Pin: view.querySelector('#txtPin').value
-                })
+                }),
+                contentType: 'application/json'
             }).then(processForgotPasswordResult);
             e.preventDefault();
             return false;
diff --git a/src/controllers/wizard/remote/index.js b/src/controllers/wizard/remote/index.js
index 74c795658d..b967d668ad 100644
--- a/src/controllers/wizard/remote/index.js
+++ b/src/controllers/wizard/remote/index.js
@@ -12,7 +12,8 @@ function save(page) {
     apiClient.ajax({
         type: 'POST',
         data: JSON.stringify(config),
-        url: apiClient.getUrl('Startup/RemoteAccess')
+        url: apiClient.getUrl('Startup/RemoteAccess'),
+        contentType: 'application/json'
     }).then(function () {
         loading.hide();
         navigateToNextPage();
diff --git a/src/controllers/wizard/settings/index.js b/src/controllers/wizard/settings/index.js
index 2eaef4fab6..12a81ccc33 100644
--- a/src/controllers/wizard/settings/index.js
+++ b/src/controllers/wizard/settings/index.js
@@ -12,7 +12,8 @@ function save(page) {
         apiClient.ajax({
             type: 'POST',
             data: JSON.stringify(config),
-            url: apiClient.getUrl('Startup/Configuration')
+            url: apiClient.getUrl('Startup/Configuration'),
+            contentType: 'application/json',
         }).then(function () {
             loading.hide();
             navigateToNextPage();
diff --git a/src/controllers/wizard/start/index.js b/src/controllers/wizard/start/index.js
index 8c147fc75e..3cd53b4ceb 100644
--- a/src/controllers/wizard/start/index.js
+++ b/src/controllers/wizard/start/index.js
@@ -18,7 +18,8 @@ function save(page) {
         apiClient.ajax({
             type: 'POST',
             data: JSON.stringify(config),
-            url: apiClient.getUrl('Startup/Configuration')
+            url: apiClient.getUrl('Startup/Configuration'),
+            contentType: 'application/json'
         }).then(function () {
             Dashboard.navigate('wizarduser.html');
         });
diff --git a/src/controllers/wizard/user/index.js b/src/controllers/wizard/user/index.js
index fc9a27855f..ec587fec8e 100644
--- a/src/controllers/wizard/user/index.js
+++ b/src/controllers/wizard/user/index.js
@@ -27,7 +27,8 @@ function submit(form) {
             Name: form.querySelector('#txtUsername').value,
             Password: form.querySelector('#txtManualPassword').value
         }),
-        url: apiClient.getUrl('Startup/User')
+        url: apiClient.getUrl('Startup/User'),
+        contentType: 'application/json'
     }).then(onUpdateUserComplete);
 }