diff --git a/Marlin/src/lcd/extui/lib/anycubic_i3mega/anycubic_i3mega_lcd.h b/Marlin/src/lcd/extui/lib/anycubic_i3mega/anycubic_i3mega_lcd.h
index a4ecf5604f9e..59050acccb2d 100644
--- a/Marlin/src/lcd/extui/lib/anycubic_i3mega/anycubic_i3mega_lcd.h
+++ b/Marlin/src/lcd/extui/lib/anycubic_i3mega/anycubic_i3mega_lcd.h
@@ -94,3 +94,4 @@ class AnycubicTFTClass {
 };
 
 extern AnycubicTFTClass AnycubicTFT;
+extern const char G28_STR[];