diff --git a/config.h b/config.h
index f912d99..aa3af42 100644
--- a/config.h
+++ b/config.h
@@ -94,7 +94,6 @@
 #define CFG_BEACON            false   // enable perdiodic beacon from CFG_APRS_RAW_BKN
 #define CFG_TEXT_PACKETS      false   // enable aprs TNC2 text packets instead of binary for interoperability with other projects (disables KISS + AX.25!)
 #define CFG_TEXT_PACKETS_3    false   // true - enable aprs-lora 3 byte prefix '<', 0xff, 0x01
-#define CFG_TEXT_PACKETS_4    false   // true - enable oe3cjb 4 byte prefix
 
 // Frequency correction for narrow band bandwidths
 #define CFG_FREQ_CORR         false   // true - correct own frequency based on received packet
diff --git a/esp32_loraprs.ino b/esp32_loraprs.ino
index 2d92c87..4ff793c 100644
--- a/esp32_loraprs.ino
+++ b/esp32_loraprs.ino
@@ -84,7 +84,6 @@ void initializeConfig(LoraPrs::Config &cfg) {
   cfg.EnableBeacon = CFG_BEACON;  // enable periodic AprsRawBeacon beacon to rf and aprsis if rf to aprsis is enabled
   cfg.EnableTextPackets = CFG_TEXT_PACKETS; // enables TNC2 text packets and disables KISS+AX25 binary frames for interoperability
   cfg.EnableTextPackets3 = CFG_TEXT_PACKETS_3; // enable aprs-lora 3 byte prefix '<', 0xff, 0x01
-  cfg.EnableTextPackets4 = CFG_TEXT_PACKETS_4; // enable 4 byte prefix
 
   // kiss
   cfg.KissEnableExtensions = CFG_KISS_EXTENSIONS; // radio control and signal reports
diff --git a/kiss_processor.cpp b/kiss_processor.cpp
index 3156139..bdebd85 100644
--- a/kiss_processor.cpp
+++ b/kiss_processor.cpp
@@ -5,7 +5,6 @@ namespace Kiss {
 Processor::Processor()
   : disableKiss_(false)
   , usePrefix3_(false)
-  , usePrefix4_(false)
   , isRawIdle_(true)
   , state_(State::GetStart)
 {
@@ -72,12 +71,6 @@ void Processor::queueSerialToRig(Cmd cmd, const byte *packet, int packetLength)
       result &= serialToRigQueue_.unshift(0xff);
       result &= serialToRigQueue_.unshift(0x01);
     }
-    if (usePrefix4_) {
-      result &= serialToRigQueue_.unshift(' ');
-      result &= serialToRigQueue_.unshift(' ');
-      result &= serialToRigQueue_.unshift(' ');
-      result &= serialToRigQueue_.unshift(' ');
-    }
     // TNC2, send as is, receiveByteRaw will deal with it
     for (int i = 0; i < packetLength; i++) {
       byte rxByte = packet[i];
@@ -138,12 +131,6 @@ bool Processor::processRigToSerial()
             rxPacketSize--;
             continue;
           }
-        // filter out first 4 bytes
-        } else if (usePrefix4_) {
-          if (i >= 0 && i <= 3) {
-            rxPacketSize--;
-            continue;
-          }
         }
       }
       buf[j++] = rxByte;
diff --git a/kiss_processor.h b/kiss_processor.h
index 4e92496..75da0b9 100644
--- a/kiss_processor.h
+++ b/kiss_processor.h
@@ -86,7 +86,6 @@ private:
 protected:
   bool disableKiss_;
   bool usePrefix3_;
-  bool usePrefix4_;
 
 private:
   bool isRawIdle_;
diff --git a/loraprs_config.h b/loraprs_config.h
index 4a0d7c3..9ff9742 100644
--- a/loraprs_config.h
+++ b/loraprs_config.h
@@ -69,7 +69,6 @@ struct Config
   bool EnableBeacon;                    // true - send AprsRawBeacon to RF and APRS-IS if EnableRfToIs is true
   bool EnableTextPackets;               // true - use TNC2 text plain messages insead of AX25 binary frames for interoperability with other projects
   bool EnableTextPackets3;              // true - enable aprs-lora 3 byte prefix '<', 0xff, 0x01
-  bool EnableTextPackets4;              // true - enable oe3cjb 4 byte prefix
 
   // external ptt tx control
   bool PttEnable;                       // true - enable external ptt control
diff --git a/loraprs_service.cpp b/loraprs_service.cpp
index 5a41443..c470da8 100644
--- a/loraprs_service.cpp
+++ b/loraprs_service.cpp
@@ -28,7 +28,6 @@ void Service::setup(const Config &conf)
   beaconLastTimestampMs_ = 0;
   disableKiss_ = conf.EnableTextPackets;
   usePrefix3_ = conf.EnableTextPackets3;
-  usePrefix4_ = conf.EnableTextPackets4;
 
   LOG_SET_OPTION(false, false, true);  // disable file, line, enable func