diff --git a/Marlin/src/feature/power.cpp b/Marlin/src/feature/power.cpp
index ede62ba89be2f..4a58253660e2b 100644
--- a/Marlin/src/feature/power.cpp
+++ b/Marlin/src/feature/power.cpp
@@ -99,6 +99,10 @@ bool Power::is_power_needed() {
   return false;
 }
 
+#ifndef POWER_TIMEOUT
+  #define POWER_TIMEOUT 0
+#endif
+
 void Power::check() {
   static millis_t nextPowerCheck = 0;
   millis_t ms = millis();
@@ -108,10 +112,8 @@ void Power::check() {
       power_on();
     else if (!lastPowerOn)
       power_off();
-    #ifdef POWER_TIMEOUT
-      else if (ELAPSED(ms, lastPowerOn + SEC_TO_MS(POWER_TIMEOUT)))
-        power_off();
-    #endif
+    else if (POWER_TIMEOUT > 0 && ELAPSED(ms, lastPowerOn + SEC_TO_MS(POWER_TIMEOUT)))
+      power_off();
   }
 }
 
@@ -139,11 +141,7 @@ void Power::power_off() {
 
 void Power::power_off_soon() {
   #if POWER_OFF_DELAY
-    #ifdef POWER_TIMEOUT
-      lastPowerOn = millis() - SEC_TO_MS(POWER_TIMEOUT) + SEC_TO_MS(POWER_OFF_DELAY);
-    #else
-      lastPowerOn = millis() + SEC_TO_MS(POWER_OFF_DELAY);
-    #endif
+    lastPowerOn = millis() - SEC_TO_MS(POWER_TIMEOUT) + SEC_TO_MS(POWER_OFF_DELAY);
   #else
     power_off();
   #endif