diff --git a/plugins/channelrx/demodam/amdemod.cpp b/plugins/channelrx/demodam/amdemod.cpp
index 8966904fc..423597af8 100644
--- a/plugins/channelrx/demodam/amdemod.cpp
+++ b/plugins/channelrx/demodam/amdemod.cpp
@@ -765,6 +765,7 @@ void AMDemod::webapiReverseSendSettings(QList<QString>& channelSettingsKeys, con
             .arg(settings.m_reverseAPIDeviceIndex)
             .arg(settings.m_reverseAPIChannelIndex);
     m_networkRequest.setUrl(QUrl(channelSettingsURL));
+    m_networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
 
     QBuffer *buffer=new QBuffer();
     buffer->open((QBuffer::ReadWrite));
diff --git a/plugins/samplesink/limesdroutput/limesdroutput.cpp b/plugins/samplesink/limesdroutput/limesdroutput.cpp
index 5988d9cb1..60f6dad63 100644
--- a/plugins/samplesink/limesdroutput/limesdroutput.cpp
+++ b/plugins/samplesink/limesdroutput/limesdroutput.cpp
@@ -1498,6 +1498,7 @@ void LimeSDROutput::webapiReverseSendSettings(QList<QString>& deviceSettingsKeys
             .arg(settings.m_reverseAPIPort)
             .arg(settings.m_reverseAPIDeviceIndex);
     m_networkRequest.setUrl(QUrl(deviceSettingsURL));
+    m_networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
 
     QBuffer *buffer=new QBuffer();
     buffer->open((QBuffer::ReadWrite));
diff --git a/plugins/samplesource/limesdrinput/limesdrinput.cpp b/plugins/samplesource/limesdrinput/limesdrinput.cpp
index 4f619ee7e..3958a1f52 100644
--- a/plugins/samplesource/limesdrinput/limesdrinput.cpp
+++ b/plugins/samplesource/limesdrinput/limesdrinput.cpp
@@ -1742,6 +1742,7 @@ void LimeSDRInput::webapiReverseSendSettings(QList<QString>& deviceSettingsKeys,
             .arg(settings.m_reverseAPIPort)
             .arg(settings.m_reverseAPIDeviceIndex);
     m_networkRequest.setUrl(QUrl(deviceSettingsURL));
+    m_networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
 
     QBuffer *buffer=new QBuffer();
     buffer->open((QBuffer::ReadWrite));
diff --git a/plugins/samplesource/rtlsdr/rtlsdrinput.cpp b/plugins/samplesource/rtlsdr/rtlsdrinput.cpp
index c52b2ef72..6281d76a7 100644
--- a/plugins/samplesource/rtlsdr/rtlsdrinput.cpp
+++ b/plugins/samplesource/rtlsdr/rtlsdrinput.cpp
@@ -836,6 +836,7 @@ void RTLSDRInput::webapiReverseSendSettings(QList<QString>& deviceSettingsKeys,
             .arg(settings.m_reverseAPIPort)
             .arg(settings.m_reverseAPIDeviceIndex);
     m_networkRequest.setUrl(QUrl(channelSettingsURL));
+    m_networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
 
     QBuffer *buffer=new QBuffer();
     buffer->open((QBuffer::ReadWrite));
diff --git a/plugins/samplesource/testsource/testsourceinput.cpp b/plugins/samplesource/testsource/testsourceinput.cpp
index ec2cb1e09..44e5a4800 100644
--- a/plugins/samplesource/testsource/testsourceinput.cpp
+++ b/plugins/samplesource/testsource/testsourceinput.cpp
@@ -682,6 +682,7 @@ void TestSourceInput::webapiReverseSendSettings(QList<QString>& deviceSettingsKe
             .arg(settings.m_reverseAPIPort)
             .arg(settings.m_reverseAPIDeviceIndex);
     m_networkRequest.setUrl(QUrl(channelSettingsURL));
+    m_networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
 
     QBuffer *buffer=new QBuffer();
     buffer->open((QBuffer::ReadWrite));