diff --git a/src/EasyOpenTherm.cpp b/src/EasyOpenTherm.cpp
index f586103..e8df629 100644
--- a/src/EasyOpenTherm.cpp
+++ b/src/EasyOpenTherm.cpp
@@ -376,8 +376,7 @@ bool                    OTPhysicalLayer::send(uint32_t                        fr
     return false;
   }
 
-//  if(_state == STATE::READY && millis() - _lastReceivedTimestampMs < 100) {
-  if(_state == STATE::READY && millis() - _lastReceivedTimestampMicros < 100) {
+  if(_state == STATE::READY && millis() - _lastReceivedTimestampMs < 100) {
 
     return false;     // Wait at least 100 ms after receiving the final bit of the latest frame before sending a new frame
   }
@@ -485,8 +484,7 @@ void                    OTPhysicalLayer::handleInterrupt() {
         lastTimestamp = timestamp;
         mask >>= 1;
       } else {                                // stop bit
-//        _lastReceivedTimestampMs = millis();
-        _lastReceivedTimestampMicros = micros();
+        _lastReceivedTimestampMs = millis();
         _state = STATE::READY;
       }
     }
diff --git a/src/EasyOpenTherm.h b/src/EasyOpenTherm.h
index 4100575..935240a 100644
--- a/src/EasyOpenTherm.h
+++ b/src/EasyOpenTherm.h
@@ -527,8 +527,7 @@ private:
 
   volatile uint32_t       _frame;
   uint32_t                _lastSentTimestampMs;
-//  volatile uint32_t       _lastReceivedTimestampMs;
-  volatile uint32_t       _lastReceivedTimestampMicros;
+  volatile uint32_t       _lastReceivedTimestampMs;
 
   uint8_t                 _rxPin;
   uint8_t                 _txPin;