diff --git a/Marlin/src/Marlin.cpp b/Marlin/src/Marlin.cpp
index 464b552dc..826ad85ef 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 defined(CHDK) || HAS_PHOTOGRAPH
-  #include "gcode/feature/camera/M240.h"
-#endif
-
 #if HAS_LCD_CONTRAST
   #include "gcode/lcd/M250.h"
 #endif
diff --git a/Marlin/src/gcode/feature/camera/M240.h b/Marlin/src/gcode/feature/camera/M240.cpp
similarity index 90%
rename from Marlin/src/gcode/feature/camera/M240.h
rename to Marlin/src/gcode/feature/camera/M240.cpp
index 31210a3d6..9d729acf3 100644
--- a/Marlin/src/gcode/feature/camera/M240.h
+++ b/Marlin/src/gcode/feature/camera/M240.cpp
@@ -20,11 +20,17 @@
  *
  */
 
+#include "../../../inc/MarlinConfig.h"
+
+#if defined(CHDK) || HAS_PHOTOGRAPH
+
+#include "../../gcode.h"
+
 /**
  * M240: Trigger a camera by emulating a Canon RC-1
  *       See http://www.doc-diy.net/photo/rc-1_hacked/
  */
-void gcode_M240() {
+void GcodeSuite::M240() {
   #ifdef CHDK
 
     OUT_WRITE(CHDK, HIGH);
@@ -51,3 +57,5 @@ void gcode_M240() {
 
   #endif
 }
+
+#endif // CHDK || HAS_PHOTOGRAPH
diff --git a/Marlin/src/gcode/gcode.cpp b/Marlin/src/gcode/gcode.cpp
index 5f965ddb5..bb0b637c9 100644
--- a/Marlin/src/gcode/gcode.cpp
+++ b/Marlin/src/gcode/gcode.cpp
@@ -119,7 +119,6 @@ void GcodeSuite::dwell(millis_t time) {
 extern void gcode_M163();
 extern void gcode_M164();
 extern void gcode_M165();
-extern void gcode_M240();
 extern void gcode_M250();
 extern void gcode_M302();
 extern void gcode_M350();
@@ -576,10 +575,8 @@ void GcodeSuite::process_next_command() {
       #endif
 
       #if defined(CHDK) || HAS_PHOTOGRAPH
-        case 240: // M240: Trigger a camera by emulating a Canon RC-1 : http://www.doc-diy.net/photo/rc-1_hacked/
-          gcode_M240();
-          break;
-      #endif // CHDK || PHOTOGRAPH_PIN
+        case 240: M240(); break;  // M240: Trigger a camera by emulating a Canon RC-1 : http://www.doc-diy.net/photo/rc-1_hacked/
+      #endif
 
       #if HAS_LCD_CONTRAST
         case 250: // M250: Set LCD contrast