diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 322b5a93c..0b3f3b529 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -4921,7 +4921,7 @@ void home_all_axes() { gcode_G28(); }
       // For LINEAR and 3POINT leveling correct the current position
 
       if (verbose_level > 0)
-        planner.bed_level_matrix.debug("\n\nBed Level Correction Matrix:");
+        planner.bed_level_matrix.debug(PSTR("\n\nBed Level Correction Matrix:"));
 
       if (!dryrun) {
         //
@@ -8362,7 +8362,7 @@ void quickstop_stepper() {
     // V to print the matrix or mesh
     if (code_seen('V')) {
       #if ABL_PLANAR
-        planner.bed_level_matrix.debug("Bed Level Correction Matrix:");
+        planner.bed_level_matrix.debug(PSTR("Bed Level Correction Matrix:"));
       #elif ENABLED(AUTO_BED_LEVELING_BILINEAR)
         if (bilinear_grid_spacing[X_AXIS]) {
           print_bilinear_leveling_grid();
@@ -9547,16 +9547,16 @@ void tool_change(const uint8_t tmp_extruder, const float fr_mm_s/*=0.0*/, bool n
 
             #if ENABLED(DEBUG_LEVELING_FEATURE)
               if (DEBUGGING(LEVELING)) {
-                tmp_offset_vec.debug("tmp_offset_vec");
-                act_offset_vec.debug("act_offset_vec");
-                offset_vec.debug("offset_vec (BEFORE)");
+                tmp_offset_vec.debug(PSTR("tmp_offset_vec"));
+                act_offset_vec.debug(PSTR("act_offset_vec"));
+                offset_vec.debug(PSTR("offset_vec (BEFORE)"));
               }
             #endif
 
             offset_vec.apply_rotation(planner.bed_level_matrix.transpose(planner.bed_level_matrix));
 
             #if ENABLED(DEBUG_LEVELING_FEATURE)
-              if (DEBUGGING(LEVELING)) offset_vec.debug("offset_vec (AFTER)");
+              if (DEBUGGING(LEVELING)) offset_vec.debug(PSTR("offset_vec (AFTER)"));
             #endif
 
             // Adjustments to the current position
diff --git a/Marlin/vector_3.cpp b/Marlin/vector_3.cpp
index 731aff813..f5aa4576d 100644
--- a/Marlin/vector_3.cpp
+++ b/Marlin/vector_3.cpp
@@ -81,8 +81,8 @@ void vector_3::apply_rotation(matrix_3x3 matrix) {
   z = resultZ;
 }
 
-void vector_3::debug(const char title[]) {
-  SERIAL_PROTOCOL(title);
+void vector_3::debug(const char * const title) {
+  serialprintPGM(title);
   SERIAL_PROTOCOLPGM(" x: ");
   SERIAL_PROTOCOL_F(x, 6);
   SERIAL_PROTOCOLPGM(" y: ");
@@ -101,14 +101,14 @@ void apply_rotation_xyz(matrix_3x3 matrix, float &x, float &y, float &z) {
 }
 
 matrix_3x3 matrix_3x3::create_from_rows(vector_3 row_0, vector_3 row_1, vector_3 row_2) {
-  //row_0.debug("row_0");
-  //row_1.debug("row_1");
-  //row_2.debug("row_2");
+  //row_0.debug(PSTR("row_0"));
+  //row_1.debug(PSTR("row_1"));
+  //row_2.debug(PSTR("row_2"));
   matrix_3x3 new_matrix;
   new_matrix.matrix[0] = row_0.x; new_matrix.matrix[1] = row_0.y; new_matrix.matrix[2] = row_0.z;
   new_matrix.matrix[3] = row_1.x; new_matrix.matrix[4] = row_1.y; new_matrix.matrix[5] = row_1.z;
   new_matrix.matrix[6] = row_2.x; new_matrix.matrix[7] = row_2.y; new_matrix.matrix[8] = row_2.z;
-  //new_matrix.debug("new_matrix");
+  //new_matrix.debug(PSTR("new_matrix"));
   return new_matrix;
 }
 
@@ -123,14 +123,14 @@ matrix_3x3 matrix_3x3::create_look_at(vector_3 target) {
   vector_3 x_row = vector_3(1, 0, -target.x / target.z).get_normal();
   vector_3 y_row = vector_3::cross(z_row, x_row).get_normal();
 
-  // x_row.debug("x_row");
-  // y_row.debug("y_row");
-  // z_row.debug("z_row");
+  // x_row.debug(PSTR("x_row"));
+  // y_row.debug(PSTR("y_row"));
+  // z_row.debug(PSTR("z_row"));
 
   // create the matrix already correctly transposed
   matrix_3x3 rot = matrix_3x3::create_from_rows(x_row, y_row, z_row);
 
-  // rot.debug("rot");
+  // rot.debug(PSTR("rot"));
   return rot;
 }
 
@@ -142,8 +142,8 @@ matrix_3x3 matrix_3x3::transpose(matrix_3x3 original) {
   return new_matrix;
 }
 
-void matrix_3x3::debug(const char title[]) {
-  SERIAL_PROTOCOLLN(title);
+void matrix_3x3::debug(const char * const title) {
+  serialprintPGM(title);
   uint8_t count = 0;
   for (uint8_t i = 0; i < 3; i++) {
     for (uint8_t j = 0; j < 3; j++) {
diff --git a/Marlin/vector_3.h b/Marlin/vector_3.h
index efc0132fe..23ef745a1 100644
--- a/Marlin/vector_3.h
+++ b/Marlin/vector_3.h
@@ -42,6 +42,7 @@
 #define VECTOR_3_H
 
 #if HAS_ABL
+
 class matrix_3x3;
 
 struct vector_3 {
@@ -58,7 +59,7 @@ struct vector_3 {
   float get_length();
   vector_3 get_normal();
 
-  void debug(const char title[]);
+  void debug(const char * const title);
 
   void apply_rotation(matrix_3x3 matrix);
 };
@@ -72,11 +73,11 @@ struct matrix_3x3 {
 
   void set_to_identity();
 
-  void debug(const char title[]);
+  void debug(const char * const title);
 };
 
 
 void apply_rotation_xyz(matrix_3x3 rotationMatrix, float& x, float& y, float& z);
-#endif // HAS_ABL
 
+#endif // HAS_ABL
 #endif // VECTOR_3_H