diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp
index bcd1585177..bb45dcafd3 100644
--- a/Marlin/src/module/temperature.cpp
+++ b/Marlin/src/module/temperature.cpp
@@ -54,10 +54,10 @@
 #if HOTEND_USES_THERMISTOR
   #if ENABLED(TEMP_SENSOR_1_AS_REDUNDANT)
     static void* heater_ttbl_map[2] = { (void*)HEATER_0_TEMPTABLE, (void*)HEATER_1_TEMPTABLE };
-    static uint8_t heater_ttbllen_map[2] = { HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN };
+    static constexpr uint8_t heater_ttbllen_map[2] = { HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN };
   #else
     static void* heater_ttbl_map[HOTENDS] = ARRAY_BY_HOTENDS((void*)HEATER_0_TEMPTABLE, (void*)HEATER_1_TEMPTABLE, (void*)HEATER_2_TEMPTABLE, (void*)HEATER_3_TEMPTABLE, (void*)HEATER_4_TEMPTABLE);
-    static uint8_t heater_ttbllen_map[HOTENDS] = ARRAY_BY_HOTENDS(HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN, HEATER_2_TEMPTABLE_LEN, HEATER_3_TEMPTABLE_LEN, HEATER_4_TEMPTABLE_LEN);
+    static constexpr uint8_t heater_ttbllen_map[HOTENDS] = ARRAY_BY_HOTENDS(HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN, HEATER_2_TEMPTABLE_LEN, HEATER_3_TEMPTABLE_LEN, HEATER_4_TEMPTABLE_LEN);
   #endif
 #endif
 
diff --git a/Marlin/src/module/thermistor/thermistors.h b/Marlin/src/module/thermistor/thermistors.h
index 70633b6ed3..d6f9e22025 100644
--- a/Marlin/src/module/thermistor/thermistors.h
+++ b/Marlin/src/module/thermistor/thermistors.h
@@ -184,21 +184,26 @@
 #ifdef THERMISTORBED
   #define BEDTEMPTABLE TT_NAME(THERMISTORBED)
   #define BEDTEMPTABLE_LEN COUNT(BEDTEMPTABLE)
+#elif defined(HEATER_BED_USES_THERMISTOR)
+  #error "No bed thermistor table specified"
 #else
-  #ifdef HEATER_BED_USES_THERMISTOR
-    #error "No bed thermistor table specified"
-  #endif
+  #define BEDTEMPTABLE_LEN 0
 #endif
 
 #ifdef THERMISTORCHAMBER
   #define CHAMBERTEMPTABLE TT_NAME(THERMISTORCHAMBER)
   #define CHAMBERTEMPTABLE_LEN COUNT(CHAMBERTEMPTABLE)
+#elif defined(HEATER_CHAMBER_USES_THERMISTOR)
+  #error "No chamber thermistor table specified"
 #else
-  #ifdef HEATER_CHAMBER_USES_THERMISTOR
-    #error "No chamber thermistor table specified"
-  #endif
+  #define CHAMBERTEMPTABLE_LEN 0
 #endif
 
+// The SCAN_THERMISTOR_TABLE macro needs alteration?
+static_assert(HEATER_0_TEMPTABLE_LEN < 128 && HEATER_1_TEMPTABLE_LEN < 128 && HEATER_2_TEMPTABLE_LEN < 128 && HEATER_3_TEMPTABLE_LEN < 128 && HEATER_4_TEMPTABLE_LEN < 128 && BEDTEMPTABLE_LEN < 128 && CHAMBERTEMPTABLE_LEN < 128,
+  "Temperature conversion tables over 127 entries need special consideration."
+);
+
 // Set the high and low raw values for the heaters
 // For thermistors the highest temperature results in the lowest ADC value
 // For thermocouples the highest temperature results in the highest ADC value