diff --git a/src/AmsToMqttBridge.ino b/src/AmsToMqttBridge.ino
index 9ab62130..70a7a236 100644
--- a/src/AmsToMqttBridge.ino
+++ b/src/AmsToMqttBridge.ino
@@ -693,7 +693,6 @@ bool readHanPort() {
 				debugI("Buffer overflow, resetting");
 				return false;
 			}
-			pos = HDLC_validate((uint8_t *) buf, len, hc, &timestamp);
 			if(pos == MBUS_FRAME_INTERMEDIATE_SEGMENT) {
 				debugI("Intermediate segment");
 				if(ma == NULL) {
diff --git a/src/ams/hdlc.h b/src/ams/hdlc.h
index 75ea0d9d..ac4cf699 100644
--- a/src/ams/hdlc.h
+++ b/src/ams/hdlc.h
@@ -22,7 +22,7 @@
 #define MBUS_FRAME_LENGTH_NOT_EQUAL -40
 #define MBUS_FRAME_INTERMEDIATE_SEGMENT -41
 #define MBUS_FRAME_LAST_SEGMENT -42
-#define MBUS_CHECKSUM_ERROR -3
+#define MBUS_CHECKSUM_ERROR -2
 
 struct HDLCConfig {
     uint8_t encryption_key[32];