diff --git a/Marlin/src/module/configuration_store.cpp b/Marlin/src/module/configuration_store.cpp
index 1265cdf1878b..b97d53662751 100644
--- a/Marlin/src/module/configuration_store.cpp
+++ b/Marlin/src/module/configuration_store.cpp
@@ -1145,7 +1145,7 @@ void MarlinSettings::postprocess() {
         EEPROM_WRITE(planner.extruder_advance_K);
       #else
         dummy = 0;
-        for (uint8_t q = EXTRUDERS; q--;) EEPROM_WRITE(dummy);
+        for (uint8_t q = MIN(EXTRUDERS, 1); q--;) EEPROM_WRITE(dummy);
       #endif
     }
 
@@ -1934,14 +1934,12 @@ void MarlinSettings::postprocess() {
       // Linear Advance
       //
       {
+        float extruder_advance_K[MIN(EXTRUDERS, 1)];
         _FIELD_TEST(planner_extruder_advance_K);
-        #if EXTRUDERS
-          float extruder_advance_K[EXTRUDERS];
-          EEPROM_READ(extruder_advance_K);
-          #if ENABLED(LIN_ADVANCE)
-            if (!validating)
-              COPY(planner.extruder_advance_K, extruder_advance_K);
-          #endif
+        EEPROM_READ(extruder_advance_K);
+        #if ENABLED(LIN_ADVANCE)
+          if (!validating)
+            COPY(planner.extruder_advance_K, extruder_advance_K);
         #endif
       }
 
@@ -2556,9 +2554,9 @@ void MarlinSettings::reset() {
   #if ENABLED(LIN_ADVANCE)
     LOOP_L_N(i, EXTRUDERS) {
       planner.extruder_advance_K[i] = LIN_ADVANCE_K;
-    #if ENABLED(EXTRA_LIN_ADVANCE_K)
-      saved_extruder_advance_K[i] = LIN_ADVANCE_K;
-    #endif
+      #if ENABLED(EXTRA_LIN_ADVANCE_K)
+        saved_extruder_advance_K[i] = LIN_ADVANCE_K;
+      #endif
     }
   #endif