diff --git a/buildroot/share/PlatformIO/scripts/preflight-checks.py b/buildroot/share/PlatformIO/scripts/preflight-checks.py
index d810120ec0..31cc202fa9 100644
--- a/buildroot/share/PlatformIO/scripts/preflight-checks.py
+++ b/buildroot/share/PlatformIO/scripts/preflight-checks.py
@@ -124,4 +124,13 @@ if pioutil.is_pio_build():
             err = "ERROR: Old files fell into your Marlin folder. Remove %s and try again" % ", ".join(mixedin)
             raise SystemExit(err)
 
+        #
+        # Check FILAMENT_RUNOUT_SCRIPT has a %c parammeter when required
+        #
+        if 'FILAMENT_RUNOUT_SENSOR' in env['MARLIN_FEATURES'] and 'NUM_RUNOUT_SENSORS' in env['MARLIN_FEATURES']:
+            if env['MARLIN_FEATURES']['NUM_RUNOUT_SENSORS'].isdigit() and int(env['MARLIN_FEATURES']['NUM_RUNOUT_SENSORS']) > 1:
+                if 'FILAMENT_RUNOUT_SCRIPT' in env['MARLIN_FEATURES'] and "%c" not in env['MARLIN_FEATURES']['FILAMENT_RUNOUT_SCRIPT']:
+                    err = "ERROR: FILAMENT_RUNOUT_SCRIPT needs a %c parameter when NUM_RUNOUT_SENSORS is > 1"
+                    raise SystemExit(err)
+    
     sanity_check_target()
diff --git a/buildroot/tests/mega2560 b/buildroot/tests/mega2560
index 4167c3e4bf..de305082ec 100755
--- a/buildroot/tests/mega2560
+++ b/buildroot/tests/mega2560
@@ -61,7 +61,7 @@ restore_configs
 opt_set MOTHERBOARD BOARD_AZTEEG_X3_PRO NUM_SERVOS 1 \
         EXTRUDERS 5 TEMP_SENSOR_1 1 TEMP_SENSOR_2 1 TEMP_SENSOR_3 1 TEMP_SENSOR_4 1 \
         NUM_RUNOUT_SENSORS 5 FIL_RUNOUT2_PIN 44 FIL_RUNOUT3_PIN 45 FIL_RUNOUT4_PIN 46 FIL_RUNOUT5_PIN 47 \
-        FIL_RUNOUT3_STATE HIGH
+        FIL_RUNOUT3_STATE HIGH FILAMENT_RUNOUT_SCRIPT '"M600 T%c"'
 opt_enable VIKI2 BOOT_MARLIN_LOGO_ANIMATED SDSUPPORT AUTO_REPORT_SD_STATUS \
            Z_PROBE_SERVO_NR Z_SERVO_ANGLES DEACTIVATE_SERVOS_AFTER_MOVE AUTO_BED_LEVELING_3POINT DEBUG_LEVELING_FEATURE \
            EEPROM_SETTINGS EEPROM_CHITCHAT M114_DETAIL AUTO_REPORT_POSITION \