diff --git a/_Boards/arduino_mega.board.json b/_Boards/arduino_mega.board.json
index 8af0c1b1..ec8aeede 100644
--- a/_Boards/arduino_mega.board.json
+++ b/_Boards/arduino_mega.board.json
@@ -11,7 +11,7 @@
     "ExtraConnectionRetry": false,
     "ForceResetOnFirmwareUpdate": false,
     "DelayAfterFirmwareUpdate": 0,
-    "DtrEnable": true,
+    "DtrEnable": false,
     "MessageSize": 90,
     "EEPROMSize": 1496
   },
diff --git a/_Boards/arduino_nano.board.json b/_Boards/arduino_nano.board.json
index cb4593eb..4d842066 100644
--- a/_Boards/arduino_nano.board.json
+++ b/_Boards/arduino_nano.board.json
@@ -10,7 +10,7 @@
   "Connection": {
     "ConnectionDelay": 1750,
     "DelayAfterFirmwareUpdate": 0,
-    "DtrEnable": true,
+    "DtrEnable": false,
     "EEPROMSize": 286,
     "ExtraConnectionRetry": true,
     "ForceResetOnFirmwareUpdate": false,
diff --git a/_Boards/arduino_uno.board.json b/_Boards/arduino_uno.board.json
index a03476f1..19626ef1 100644
--- a/_Boards/arduino_uno.board.json
+++ b/_Boards/arduino_uno.board.json
@@ -10,7 +10,7 @@
   "Connection": {
     "ConnectionDelay": 1750,
     "DelayAfterFirmwareUpdate": 0,
-    "DtrEnable": true,
+    "DtrEnable": false,
     "EEPROMSize": 286,
     "ExtraConnectionRetry": true,
     "ForceResetOnFirmwareUpdate": false,