diff --git a/code/espurna/sensors/MHZ19Sensor.h b/code/espurna/sensors/MHZ19Sensor.h
index 1c039e6a..201625cb 100644
--- a/code/espurna/sensors/MHZ19Sensor.h
+++ b/code/espurna/sensors/MHZ19Sensor.h
@@ -76,7 +76,7 @@ class MHZ19Sensor : public BaseSensor {
 
             if (_serial) delete _serial;
 
-            _serial = new SoftwareSerial(_pin_rx, _pin_tx, false, 256);
+            _serial = new SoftwareSerial(_pin_rx, _pin_tx, false, 32);
             _serial->begin(9600);
             calibrateAuto(false);
 
diff --git a/code/espurna/sensors/PMSX003Sensor.h b/code/espurna/sensors/PMSX003Sensor.h
index 25cd233d..6a08157e 100644
--- a/code/espurna/sensors/PMSX003Sensor.h
+++ b/code/espurna/sensors/PMSX003Sensor.h
@@ -67,7 +67,7 @@ class PMSX003Sensor : public BaseSensor {
             if (_serial) delete _serial;
             if (_pms) delete _pms;
 
-            _serial = new SoftwareSerial(_pin_rx, _pin_tx, false, 256);
+            _serial = new SoftwareSerial(_pin_rx, _pin_tx, false, 32);
             _serial->begin(9600);
             _pms = new PMS(* _serial);
             _pms->passiveMode();
diff --git a/code/espurna/sensors/V9261FSensor.h b/code/espurna/sensors/V9261FSensor.h
index 7d244fba..6d846d58 100644
--- a/code/espurna/sensors/V9261FSensor.h
+++ b/code/espurna/sensors/V9261FSensor.h
@@ -65,7 +65,7 @@ class V9261FSensor : public BaseSensor {
 
             if (_serial) delete _serial;
 
-            _serial = new SoftwareSerial(_pin_rx, SW_SERIAL_UNUSED_PIN, _inverted, 256);
+            _serial = new SoftwareSerial(_pin_rx, SW_SERIAL_UNUSED_PIN, _inverted, 32);
             _serial->begin(V9261F_BAUDRATE);
 
         }