diff --git a/components/dht22/dht22.c b/components/dht22/dht22.c
index efd683a..9285268 100644
--- a/components/dht22/dht22.c
+++ b/components/dht22/dht22.c
@@ -24,8 +24,8 @@ dht22_error dht22_read() {
   if (data[2] & 0x80) {
       _dht22_temperature = -1 * _dht22_temperature;
   }
-  uint8_t checksum_val = (data[0] + data[1] + data[2] + data[2]) & 0xff;
-  if (checksum_val != data[5]) {
+  uint8_t checksum_val = (data[0] + data[1] + data[2] + data[3]) & 0xff;
+  if (checksum_val != data[4]) {
     _dht22_relative_humidity = UINT16_MAX;
     _dht22_temperature = INT16_MIN;
     return DHT22_CHECKSUM_ERROR;