diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index 2af9d820ed..8cd2faf7f8 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -416,7 +416,7 @@
  *   998 : Dummy Table that ALWAYS reads 25°C or the temperature defined below.
  *   999 : Dummy Table that ALWAYS reads 100°C or the temperature defined below.
  */
-#define TEMP_SENSOR_0 21
+#define TEMP_SENSOR_0 1
 #define TEMP_SENSOR_1 0
 #define TEMP_SENSOR_2 0
 #define TEMP_SENSOR_3 0