diff --git a/Marlin/Marlin.h b/Marlin/Marlin.h
index 353cf50a44..45bf622471 100644
--- a/Marlin/Marlin.h
+++ b/Marlin/Marlin.h
@@ -226,7 +226,7 @@ void kill(const char*);
 void Stop();
 
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
-  void filrunout();
+  void handle_filament_runout();
 #endif
 
 /**
diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 1f4863d1f3..63cee03230 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -446,7 +446,7 @@ static uint8_t target_extruder;
 #endif
 
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
-  static bool filrunoutEnqueued = false;
+  static bool filament_ran_out = false;
 #endif
 
 static bool send_ok[BUFSIZE];
@@ -6105,7 +6105,7 @@ inline void gcode_M503() {
     #endif
 
     #if ENABLED(FILAMENT_RUNOUT_SENSOR)
-      filrunoutEnqueued = false;
+      filament_ran_out = false;
     #endif
 
   }
@@ -7741,7 +7741,7 @@ void manage_inactivity(bool ignore_stepper_queue/*=false*/) {
 
   #if HAS_FILRUNOUT
     if (IS_SD_PRINTING && !(READ(FILRUNOUT_PIN) ^ FIL_RUNOUT_INVERTING))
-      filrunout();
+      handle_filament_runout();
   #endif
 
   if (commands_in_queue < BUFSIZE) get_available_commands();
@@ -7924,9 +7924,9 @@ void kill(const char* lcd_msg) {
 
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
 
-  void filrunout() {
-    if (!filrunoutEnqueued) {
-      filrunoutEnqueued = true;
+  void handle_filament_runout() {
+    if (!filament_ran_out) {
+      filament_ran_out = true;
       enqueue_and_echo_commands_P(PSTR(FILAMENT_RUNOUT_SCRIPT));
       st_synchronize();
     }