diff --git a/Marlin/src/module/settings.cpp b/Marlin/src/module/settings.cpp
index 354fb4b172..9a7635fc51 100644
--- a/Marlin/src/module/settings.cpp
+++ b/Marlin/src/module/settings.cpp
@@ -3313,7 +3313,7 @@ void MarlinSettings::reset() {
     #if ENABLED(DISTINCT_E_FACTORS)
       constexpr float linAdvanceK[] = ADVANCE_K;
       EXTRUDER_LOOP() {
-        const float a = linAdvanceK[_MAX(e, COUNT(linAdvanceK) - 1)];
+        const float a = linAdvanceK[_MAX(uint8_t(e), COUNT(linAdvanceK) - 1)];
         planner.extruder_advance_K[e] = a;
         TERN_(ADVANCE_K_EXTRA, other_extruder_advance_K[e] = a);
       }