diff --git a/tasmota/support_tasmota.ino b/tasmota/support_tasmota.ino
index 23a4caad7..ed0355a88 100644
--- a/tasmota/support_tasmota.ino
+++ b/tasmota/support_tasmota.ino
@@ -1286,9 +1286,9 @@ void SerialInput(void)
     char hex_char[(serial_in_byte_counter * 2) + 2];
     bool assume_json = (!Settings.flag.mqtt_serial_raw && (serial_in_buffer[0] == '{'));
     Response_P(PSTR("{\"" D_JSON_SERIALRECEIVED "\":%s%s%s}"),
-      (assume_json) ? "" : """",
+      (assume_json) ? "" : "\"",
       (Settings.flag.mqtt_serial_raw) ? ToHex_P((unsigned char*)serial_in_buffer, serial_in_byte_counter, hex_char, sizeof(hex_char)) : serial_in_buffer,
-      (assume_json) ? "" : """");
+      (assume_json) ? "" : "\"");
     MqttPublishPrefixTopic_P(RESULT_OR_TELE, PSTR(D_JSON_SERIALRECEIVED));
     XdrvRulesProcess();
     serial_in_byte_counter = 0;
diff --git a/tasmota/xdrv_08_serial_bridge.ino b/tasmota/xdrv_08_serial_bridge.ino
index c4f530a21..990bf9c32 100644
--- a/tasmota/xdrv_08_serial_bridge.ino
+++ b/tasmota/xdrv_08_serial_bridge.ino
@@ -73,9 +73,9 @@ void SerialBridgeInput(void)
     char hex_char[(serial_bridge_in_byte_counter * 2) + 2];
     bool assume_json = (!serial_bridge_raw && (serial_bridge_buffer[0] == '{'));
     Response_P(PSTR("{\"" D_JSON_SSERIALRECEIVED "\":%s%s%s}"),
-      (assume_json) ? "" : """",
+      (assume_json) ? "" : "\"",
       (serial_bridge_raw) ? ToHex_P((unsigned char*)serial_bridge_buffer, serial_bridge_in_byte_counter, hex_char, sizeof(hex_char)) : serial_bridge_buffer,
-      (assume_json) ? "" : """");
+      (assume_json) ? "" : "\"");
     MqttPublishPrefixTopic_P(RESULT_OR_TELE, PSTR(D_JSON_SSERIALRECEIVED));
     XdrvRulesProcess();
     serial_bridge_in_byte_counter = 0;