diff --git a/Marlin/src/inc/Conditionals_post.h b/Marlin/src/inc/Conditionals_post.h
index a5a1070b03b4b..d710134ef0f37 100644
--- a/Marlin/src/inc/Conditionals_post.h
+++ b/Marlin/src/inc/Conditionals_post.h
@@ -525,6 +525,14 @@
 #endif
 #undef ANY_TEMP_SENSOR_IS
 
+#ifndef TEMP_SENSOR_REDUNDANT_SOURCE
+  #define TEMP_SENSOR_REDUNDANT_SOURCE 1
+#endif
+
+#ifndef TEMP_SENSOR_REDUNDANT_TARGET
+  #define TEMP_SENSOR_REDUNDANT_TARGET 0
+#endif
+
 // Usurp a sensor to do redundant readings
 #if TEMP_SENSOR_REDUNDANT && !PIN_EXISTS(TEMP_REDUNDANT)
   #if TEMP_SENSOR_REDUNDANT_SOURCE == -5
diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp
index 9274d0631e992..9f32ce933bff5 100644
--- a/Marlin/src/module/temperature.cpp
+++ b/Marlin/src/module/temperature.cpp
@@ -2090,16 +2090,30 @@ void Temperature::init() {
   #endif
 
   #if HAS_MAX31865_TEMP
-    TERN_(TEMP_SENSOR_IS_MAX(0, MAX31865), max31865_0.begin(MAX31865_2WIRE)); // MAX31865_2WIRE, MAX31865_3WIRE, MAX31865_4WIRE
-    TERN_(TEMP_SENSOR_IS_MAX(1, MAX31865), max31865_1.begin(MAX31865_2WIRE));
+    #if TEMP_SENSOR_IS_MAX(0, MAX31865)
+      max31865_0.begin(MAX31865_2WIRE); // MAX31865_2WIRE, MAX31865_3WIRE, MAX31865_4WIRE
+    #endif
+    #if TEMP_SENSOR_IS_MAX(1, MAX31865)
+      max31865_1.begin(MAX31865_2WIRE);
+    #endif
   #endif
+
   #if HAS_MAX31855_TEMP
-    TERN_(TEMP_SENSOR_IS_MAX(0, MAX31855), max31855_0.begin());
-    TERN_(TEMP_SENSOR_IS_MAX(1, MAX31855), max31855_1.begin());
+    #if TEMP_SENSOR_IS_MAX(0, MAX31855)
+      max31855_0.begin(MAX31855);
+    #endif
+    #if TEMP_SENSOR_IS_MAX(1, MAX31855)
+      max31855_1.begin(MAX31855);
+    #endif
   #endif
+
   #if HAS_MAX6675_TEMP
-    TERN_(TEMP_SENSOR_IS_MAX(0, MAX6675), max6675_0.begin());
-    TERN_(TEMP_SENSOR_IS_MAX(1, MAX6675), max6675_1.begin());
+    #if TEMP_SENSOR_IS_MAX(0, MAX6675)
+      max6675_0.begin(MAX6675);
+    #endif
+    #if TEMP_SENSOR_IS_MAX(1, MAX6675)
+      max6675_1.begin(MAX6675);
+    #endif
   #endif
 
   #if MB(RUMBA)