diff --git a/Marlin/src/Marlin.cpp b/Marlin/src/Marlin.cpp
index f93f3115df..36c5b880d3 100644
--- a/Marlin/src/Marlin.cpp
+++ b/Marlin/src/Marlin.cpp
@@ -169,7 +169,6 @@ static float saved_feedrate_mm_s;
 int16_t feedrate_percentage = 100, saved_feedrate_percentage;
 
 // Initialized by settings.load()
-bool volumetric_enabled;
 float filament_size[EXTRUDERS], volumetric_multiplier[EXTRUDERS];
 
 #if HAS_WORKSPACE_OFFSET
@@ -3295,7 +3294,7 @@ void set_current_from_steppers_for_axis(const AxisEnum axis) {
 #endif // FILAMENT_RUNOUT_SENSOR
 
 float calculate_volumetric_multiplier(const float diameter) {
-  if (!volumetric_enabled || diameter == 0) return 1.0;
+  if (!parser.volumetric_enabled || diameter == 0) return 1.0;
   return 1.0 / (M_PI * sq(diameter * 0.5));
 }
 
diff --git a/Marlin/src/Marlin.h b/Marlin/src/Marlin.h
index 0d84af3d6c..33ff9ab0be 100644
--- a/Marlin/src/Marlin.h
+++ b/Marlin/src/Marlin.h
@@ -186,7 +186,6 @@ extern int16_t feedrate_percentage;
 
 #define MMS_SCALED(MM_S) ((MM_S)*feedrate_percentage*0.01)
 
-extern bool volumetric_enabled;
 extern float filament_size[EXTRUDERS]; // cross-sectional area of filament (in millimeters), typically around 1.75 or 2.85, 0 disables the volumetric calculations for the extruder.
 extern float volumetric_multiplier[EXTRUDERS]; // reciprocal of cross-sectional area of filament (in square millimeters), stored this way to reduce computational burden in planner
 
diff --git a/Marlin/src/gcode/config/M200.cpp b/Marlin/src/gcode/config/M200.cpp
index eae17689c5..b70879fc48 100644
--- a/Marlin/src/gcode/config/M200.cpp
+++ b/Marlin/src/gcode/config/M200.cpp
@@ -37,8 +37,8 @@ void GcodeSuite::M200() {
     // setting any extruder filament size disables volumetric on the assumption that
     // slicers either generate in extruder values as cubic mm or as as filament feeds
     // for all extruders
-    volumetric_enabled = (parser.value_linear_units() != 0.0);
-    if (volumetric_enabled) {
+    parser.volumetric_enabled = (parser.value_linear_units() != 0.0);
+    if (parser.volumetric_enabled) {
       filament_size[target_extruder] = parser.value_linear_units();
       // make sure all extruders have some sane value for the filament size
       for (uint8_t i = 0; i < COUNT(filament_size); i++)
diff --git a/Marlin/src/gcode/parser.cpp b/Marlin/src/gcode/parser.cpp
index 6cf8b8ee07..373a1caceb 100644
--- a/Marlin/src/gcode/parser.cpp
+++ b/Marlin/src/gcode/parser.cpp
@@ -35,6 +35,8 @@
 // Must be declared for allocation and to satisfy the linker
 // Zero values need no initialization.
 
+bool GCodeParser::volumetric_enabled;
+
 #if ENABLED(INCH_MODE_SUPPORT)
   float GCodeParser::linear_unit_factor, GCodeParser::volumetric_unit_factor;
 #endif
diff --git a/Marlin/src/gcode/parser.h b/Marlin/src/gcode/parser.h
index 9743a7bb99..c829e66c98 100644
--- a/Marlin/src/gcode/parser.h
+++ b/Marlin/src/gcode/parser.h
@@ -33,10 +33,6 @@
 
 //#define DEBUG_GCODE_PARSER
 
-#if ENABLED(INCH_MODE_SUPPORT)
-  extern bool volumetric_enabled;
-#endif
-
 /**
  * GCode parser
  *
@@ -65,6 +61,8 @@ public:
 
   // Global states for GCode-level units features
 
+  static bool volumetric_enabled;
+
   #if ENABLED(INCH_MODE_SUPPORT)
     static float linear_unit_factor, volumetric_unit_factor;
   #endif
diff --git a/Marlin/src/lcd/ultralcd.cpp b/Marlin/src/lcd/ultralcd.cpp
index d796f45faa..ae747f2132 100644
--- a/Marlin/src/lcd/ultralcd.cpp
+++ b/Marlin/src/lcd/ultralcd.cpp
@@ -3445,9 +3445,9 @@ void kill_screen(const char* lcd_msg) {
       MENU_ITEM_EDIT(float3, MSG_ADVANCE_K, &planner.extruder_advance_k, 0, 999);
     #endif
 
-    MENU_ITEM_EDIT_CALLBACK(bool, MSG_VOLUMETRIC_ENABLED, &volumetric_enabled, calculate_volumetric_multipliers);
+    MENU_ITEM_EDIT_CALLBACK(bool, MSG_VOLUMETRIC_ENABLED, &parser.volumetric_enabled, calculate_volumetric_multipliers);
 
-    if (volumetric_enabled) {
+    if (parser.volumetric_enabled) {
       #if EXTRUDERS == 1
         MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(float43, MSG_FILAMENT_DIAM, &filament_size[0], 1.5, 3.25, calculate_volumetric_multipliers);
       #else // EXTRUDERS > 1
diff --git a/Marlin/src/module/configuration_store.cpp b/Marlin/src/module/configuration_store.cpp
index 898c496cd1..3eb692f430 100644
--- a/Marlin/src/module/configuration_store.cpp
+++ b/Marlin/src/module/configuration_store.cpp
@@ -137,7 +137,7 @@
  *  533  M208 R    swap_retract_recover_feedrate_mm_s (float)
  *
  * Volumetric Extrusion:                            21 bytes
- *  537  M200 D    volumetric_enabled               (bool)
+ *  537  M200 D    parser.volumetric_enabled        (bool)
  *  538  M200 T D  filament_size                    (float x5) (T0..3)
  *
  * HAVE_TMC2130:                                    20 bytes
@@ -185,9 +185,7 @@ MarlinSettings settings;
 #include "../core/language.h"
 #include "../Marlin.h"
 
-#if ENABLED(INCH_MODE_SUPPORT) || (ENABLED(ULTIPANEL) && ENABLED(TEMPERATURE_UNITS_SUPPORT))
-  #include "../gcode/parser.h"
-#endif
+#include "../gcode/parser.h"
 
 #if HAS_BED_PROBE
   #include "../module/probe.h"
@@ -511,7 +509,7 @@ void MarlinSettings::postprocess() {
       EEPROM_WRITE(fwretract.swap_retract_recover_feedrate_mm_s);
     #endif
 
-    EEPROM_WRITE(volumetric_enabled);
+    EEPROM_WRITE(parser.volumetric_enabled);
 
     // Save filament sizes
     for (uint8_t q = 0; q < MAX_EXTRUDERS; q++) {
@@ -897,7 +895,7 @@ void MarlinSettings::postprocess() {
         for (uint8_t q=8; q--;) EEPROM_READ(dummy);
       #endif
 
-      EEPROM_READ(volumetric_enabled);
+      EEPROM_READ(parser.volumetric_enabled);
 
       for (uint8_t q = 0; q < MAX_EXTRUDERS; q++) {
         EEPROM_READ(dummy);
@@ -1259,7 +1257,7 @@ void MarlinSettings::reset() {
     fwretract.reset();
   #endif
 
-  volumetric_enabled =
+  parser.volumetric_enabled =
     #if ENABLED(VOLUMETRIC_DEFAULT_ON)
       true
     #else
@@ -1350,7 +1348,7 @@ void MarlinSettings::reset() {
     CONFIG_ECHO_START;
     #if ENABLED(INCH_MODE_SUPPORT)
       #define LINEAR_UNIT(N) ((N) / parser.linear_unit_factor)
-      #define VOLUMETRIC_UNIT(N) ((N) / (volumetric_enabled ? parser.volumetric_unit_factor : parser.linear_unit_factor))
+      #define VOLUMETRIC_UNIT(N) ((N) / (parser.volumetric_enabled ? parser.volumetric_unit_factor : parser.linear_unit_factor))
       SERIAL_ECHOPGM("  G2");
       SERIAL_CHAR(parser.linear_unit_factor == 1.0 ? '1' : '0');
       SERIAL_ECHOPGM(" ; Units in ");
@@ -1387,7 +1385,7 @@ void MarlinSettings::reset() {
     if (!forReplay) {
       CONFIG_ECHO_START;
       SERIAL_ECHOPGM("Filament settings:");
-      if (volumetric_enabled)
+      if (parser.volumetric_enabled)
         SERIAL_EOL();
       else
         SERIAL_ECHOLNPGM(" Disabled");
@@ -1417,7 +1415,7 @@ void MarlinSettings::reset() {
       #endif // EXTRUDERS > 2
     #endif // EXTRUDERS > 1
 
-    if (!volumetric_enabled) {
+    if (!parser.volumetric_enabled) {
       CONFIG_ECHO_START;
       SERIAL_ECHOLNPGM("  M200 D0");
     }