diff --git a/application.c b/application.c
index fb122ca..3edb46b 100644
--- a/application.c
+++ b/application.c
@@ -207,8 +207,8 @@ static float lid_temperature(void)
 
 	// convert to °C
 	// calibrated using a DS18B20 (accuracy = +- 0.5°C), with 12-bit precision
-	// 2.7013 V = 20.500 °C, 0.35925 V = 84.062 °C
-	return -27.125 * voltages[1] + 93.7727;
+	// 2.3491 V = 21.500 C, 0.1337 V = 104.9 °C
+	return -37.6456 * voltages[1] + 109.933;
 }
 
 /** set the power delivered to the lid heater