diff --git a/Marlin/src/Marlin.cpp b/Marlin/src/Marlin.cpp
index b652b0ff38..ffe9cdc868 100644
--- a/Marlin/src/Marlin.cpp
+++ b/Marlin/src/Marlin.cpp
@@ -349,8 +349,6 @@
 
 bool Running = true;
 
-uint8_t marlin_debug_flags = DEBUG_NONE;
-
 /**
  * Cartesian Current Position
  *   Used to track the logical position as moves are queued.
@@ -732,31 +730,6 @@ void tool_change(const uint8_t tmp_extruder, const float fr_mm_s=0.0, bool no_mo
 void report_current_position();
 void report_current_position_detail();
 
-#if ENABLED(DEBUG_LEVELING_FEATURE)
-  void print_xyz(const char* prefix, const char* suffix, const float x, const float y, const float z) {
-    serialprintPGM(prefix);
-    SERIAL_CHAR('(');
-    SERIAL_ECHO(x);
-    SERIAL_ECHOPAIR(", ", y);
-    SERIAL_ECHOPAIR(", ", z);
-    SERIAL_CHAR(')');
-    if (suffix) serialprintPGM(suffix); else SERIAL_EOL();
-  }
-
-  void print_xyz(const char* prefix, const char* suffix, const float xyz[]) {
-    print_xyz(prefix, suffix, xyz[X_AXIS], xyz[Y_AXIS], xyz[Z_AXIS]);
-  }
-
-  #if HAS_ABL
-    void print_xyz(const char* prefix, const char* suffix, const vector_3 &xyz) {
-      print_xyz(prefix, suffix, xyz.x, xyz.y, xyz.z);
-    }
-  #endif
-
-  #define DEBUG_POS(SUFFIX,VAR) do { \
-    print_xyz(PSTR("  " STRINGIFY(VAR) "="), PSTR(" : " SUFFIX "\n"), VAR); }while(0)
-#endif
-
 /**
  * sync_plan_position
  *
diff --git a/Marlin/src/Marlin.h b/Marlin/src/Marlin.h
index 4292ccddb4..590450ea1b 100644
--- a/Marlin/src/Marlin.h
+++ b/Marlin/src/Marlin.h
@@ -184,9 +184,6 @@ void quickstop_stepper();
   void handle_filament_runout();
 #endif
 
-extern uint8_t marlin_debug_flags;
-#define DEBUGGING(F) (marlin_debug_flags & (DEBUG_## F))
-
 extern bool Running;
 inline bool IsRunning() { return  Running; }
 inline bool IsStopped() { return !Running; }
diff --git a/Marlin/src/core/enum.h b/Marlin/src/core/enum.h
index c02e597f8b..9bee5db459 100644
--- a/Marlin/src/core/enum.h
+++ b/Marlin/src/core/enum.h
@@ -69,22 +69,6 @@ typedef enum {
   TEMPUNIT_F
 } TempUnit;
 
-/**
- * Debug flags
- * Not yet widely applied
- */
-enum DebugFlags {
-  DEBUG_NONE          = 0,
-  DEBUG_ECHO          = _BV(0), ///< Echo commands in order as they are processed
-  DEBUG_INFO          = _BV(1), ///< Print messages for code that has debug output
-  DEBUG_ERRORS        = _BV(2), ///< Not implemented
-  DEBUG_DRYRUN        = _BV(3), ///< Ignore temperature setting and E movement commands
-  DEBUG_COMMUNICATION = _BV(4), ///< Not implemented
-  DEBUG_LEVELING      = _BV(5), ///< Print detailed output for homing and leveling
-  DEBUG_MESH_ADJUST   = _BV(6), ///< UBL bed leveling
-  DEBUG_ALL           = 0xFF
-};
-
 enum EndstopEnum {
   X_MIN,
   Y_MIN,
diff --git a/Marlin/src/core/serial.cpp b/Marlin/src/core/serial.cpp
index 15528c4506..b46f398d71 100644
--- a/Marlin/src/core/serial.cpp
+++ b/Marlin/src/core/serial.cpp
@@ -22,6 +22,8 @@
 
 #include "serial.h"
 
+uint8_t marlin_debug_flags = DEBUG_NONE;
+
 const char errormagic[] PROGMEM = "Error:";
 const char echomagic[] PROGMEM = "echo:";
 
@@ -43,3 +45,27 @@ void serial_echopair_P(const char* s_P, double v)        { serialprintPGM(s_P);
 void serial_echopair_P(const char* s_P, unsigned long v) { serialprintPGM(s_P); SERIAL_ECHO(v); }
 
 void serial_spaces(uint8_t count) { count *= (PROPORTIONAL_FONT_RATIO); while (count--) MYSERIAL.write(' '); }
+
+#if ENABLED(DEBUG_LEVELING_FEATURE)
+
+  void print_xyz(const char* prefix, const char* suffix, const float x, const float y, const float z) {
+    serialprintPGM(prefix);
+    SERIAL_CHAR('(');
+    SERIAL_ECHO(x);
+    SERIAL_ECHOPAIR(", ", y);
+    SERIAL_ECHOPAIR(", ", z);
+    SERIAL_CHAR(')');
+    if (suffix) serialprintPGM(suffix); else SERIAL_EOL();
+  }
+
+  void print_xyz(const char* prefix, const char* suffix, const float xyz[]) {
+    print_xyz(prefix, suffix, xyz[X_AXIS], xyz[Y_AXIS], xyz[Z_AXIS]);
+  }
+
+  #if HAS_ABL
+    void print_xyz(const char* prefix, const char* suffix, const vector_3 &xyz) {
+      print_xyz(prefix, suffix, xyz.x, xyz.y, xyz.z);
+    }
+  #endif
+
+#endif
diff --git a/Marlin/src/core/serial.h b/Marlin/src/core/serial.h
index e860c9c05f..81c35a75e1 100644
--- a/Marlin/src/core/serial.h
+++ b/Marlin/src/core/serial.h
@@ -41,6 +41,26 @@
   #endif
 #endif
 
+#include "../libs/vector_3.h"
+
+/**
+ * Define debug bit-masks
+ */
+enum DebugFlags {
+  DEBUG_NONE          = 0,
+  DEBUG_ECHO          = _BV(0), ///< Echo commands in order as they are processed
+  DEBUG_INFO          = _BV(1), ///< Print messages for code that has debug output
+  DEBUG_ERRORS        = _BV(2), ///< Not implemented
+  DEBUG_DRYRUN        = _BV(3), ///< Ignore temperature setting and E movement commands
+  DEBUG_COMMUNICATION = _BV(4), ///< Not implemented
+  DEBUG_LEVELING      = _BV(5), ///< Print detailed output for homing and leveling
+  DEBUG_MESH_ADJUST   = _BV(6), ///< UBL bed leveling
+  DEBUG_ALL           = 0xFF
+};
+
+extern uint8_t marlin_debug_flags;
+#define DEBUGGING(F) (marlin_debug_flags & (DEBUG_## F))
+
 extern const char echomagic[] PROGMEM;
 extern const char errormagic[] PROGMEM;
 
@@ -100,4 +120,14 @@ void serial_spaces(uint8_t count);
 //
 void serialprintPGM(const char* str);
 
+#if ENABLED(DEBUG_LEVELING_FEATURE)
+  void print_xyz(const char* prefix, const char* suffix, const float x, const float y, const float z);
+  void print_xyz(const char* prefix, const char* suffix, const float xyz[]);
+  #if HAS_ABL
+    void print_xyz(const char* prefix, const char* suffix, const vector_3 &xyz);
+  #endif
+  #define DEBUG_POS(SUFFIX,VAR) do { \
+    print_xyz(PSTR("  " STRINGIFY(VAR) "="), PSTR(" : " SUFFIX "\n"), VAR); }while(0)
+#endif
+
 #endif // __SERIAL_H__