diff --git a/esphome/components/sm300d2/sm300d2.cpp b/esphome/components/sm300d2/sm300d2.cpp
index 34d80349f9..b1787581ae 100644
--- a/esphome/components/sm300d2/sm300d2.cpp
+++ b/esphome/components/sm300d2/sm300d2.cpp
@@ -27,7 +27,8 @@ void SM300D2Sensor::update() {
   }
 
   uint16_t calculated_checksum = this->sm300d2_checksum_(response);
-  if (calculated_checksum != response[SM300D2_RESPONSE_LENGTH - 1]) {
+  if ((calculated_checksum != response[SM300D2_RESPONSE_LENGTH - 1]) &&
+      (calculated_checksum - 0x80 != response[SM300D2_RESPONSE_LENGTH - 1])) {
     ESP_LOGW(TAG, "SM300D2 Checksum doesn't match: 0x%02X!=0x%02X", response[SM300D2_RESPONSE_LENGTH - 1],
              calculated_checksum);
     this->status_set_warning();