diff --git a/Marlin/src/Marlin.cpp b/Marlin/src/Marlin.cpp
index 4f2941790..8798e824b 100644
--- a/Marlin/src/Marlin.cpp
+++ b/Marlin/src/Marlin.cpp
@@ -352,10 +352,6 @@ bool pin_is_protected(const int8_t pin) {
   return false;
 }
 
-#if ENABLED(PIDTEMP)
-  #include "gcode/config/M301.h"
-#endif
-
 #if ENABLED(PIDTEMPBED)
   #include "gcode/config/M304.h"
 #endif
diff --git a/Marlin/src/gcode/config/M301.h b/Marlin/src/gcode/config/M301.cpp
similarity index 93%
rename from Marlin/src/gcode/config/M301.h
rename to Marlin/src/gcode/config/M301.cpp
index e775bbe1c..4df4a2c0e 100644
--- a/Marlin/src/gcode/config/M301.h
+++ b/Marlin/src/gcode/config/M301.cpp
@@ -20,6 +20,13 @@
  *
  */
 
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(PIDTEMP)
+
+#include "../gcode.h"
+#include "../../module/temperature.h"
+
 /**
  * M301: Set PID parameters P I D (and optionally C, L)
  *
@@ -32,7 +39,7 @@
  *   C[float] Kc term
  *   L[float] LPQ length
  */
-void gcode_M301() {
+void GcodeSuite::M301() {
 
   // multi-extruder PID patch: M301 updates or prints a single extruder's PID values
   // default behaviour (omitting E parameter) is to update for extruder 0 only
@@ -67,3 +74,5 @@ void gcode_M301() {
     SERIAL_ERRORLN(MSG_INVALID_EXTRUDER);
   }
 }
+
+#endif // PIDTEMP
diff --git a/Marlin/src/gcode/gcode.cpp b/Marlin/src/gcode/gcode.cpp
index 5e089afb2..9a24eb877 100644
--- a/Marlin/src/gcode/gcode.cpp
+++ b/Marlin/src/gcode/gcode.cpp
@@ -121,7 +121,6 @@ extern void gcode_M164();
 extern void gcode_M165();
 extern void gcode_M240();
 extern void gcode_M250();
-extern void gcode_M301();
 extern void gcode_M302();
 extern void gcode_M304();
 extern void gcode_M350();
@@ -570,10 +569,8 @@ void GcodeSuite::process_next_command() {
       #endif
 
       #if ENABLED(PIDTEMP)
-        case 301: // M301: Set hotend PID parameters
-          gcode_M301();
-          break;
-      #endif // PIDTEMP
+        case 301: M301(); break;  // M301: Set hotend PID parameters
+      #endif
 
       #if ENABLED(PIDTEMPBED)
         case 304: // M304: Set bed PID parameters