diff --git a/Marlin/src/lcd/extui/lib/ftdi_eve_touch_ui/compat.h b/Marlin/src/lcd/extui/lib/ftdi_eve_touch_ui/compat.h
index 741b7076d146..da4b739826e7 100644
--- a/Marlin/src/lcd/extui/lib/ftdi_eve_touch_ui/compat.h
+++ b/Marlin/src/lcd/extui/lib/ftdi_eve_touch_ui/compat.h
@@ -50,3 +50,4 @@
 
 class __FlashStringHelper;
 typedef const __FlashStringHelper *progmem_str;
+extern const char G28_STR[];