diff --git a/Marlin/src/module/stepper.h b/Marlin/src/module/stepper.h
index 14617633eba70..b7cc8165fb03b 100644
--- a/Marlin/src/module/stepper.h
+++ b/Marlin/src/module/stepper.h
@@ -341,9 +341,9 @@ constexpr ena_mask_t enable_overlap[] = {
                                       TERN0(INPUT_SHAPING_Y, DMF.y * SPU.y);
     #if defined(__AVR__) || !defined(ADAPTIVE_STEP_SMOOTHING)
       // MIN_STEP_ISR_FREQUENCY is known at compile time on AVRs and any reduction in SRAM is welcome
+      constexpr feedRate_t _DMF[] = DEFAULT_MAX_FEEDRATE;
+      constexpr float _DASU[] = DEFAULT_AXIS_STEPS_PER_UNIT;
       template<int INDEX=DISTINCT_AXES> constexpr float max_isr_rate() {
-        constexpr feedRate_t _DMF[] = DEFAULT_MAX_FEEDRATE;
-        constexpr float _DASU[] = DEFAULT_AXIS_STEPS_PER_UNIT;
         return _MAX(_DMF[INDEX - 1] * _DASU[INDEX - 1], max_isr_rate<INDEX - 1>());
       }
       template<> constexpr float max_isr_rate<0>() {