diff --git a/Marlin/src/inc/Conditionals_adv.h b/Marlin/src/inc/Conditionals_adv.h
index 3e43db4ad6..9d7f790db7 100644
--- a/Marlin/src/inc/Conditionals_adv.h
+++ b/Marlin/src/inc/Conditionals_adv.h
@@ -702,7 +702,7 @@
 #endif
 
 #if ENABLED(HOST_PROMPT_SUPPORT) && DISABLED(EMERGENCY_PARSER)
-  #define HAS_GCODE_M876
+  #define HAS_GCODE_M876 1
 #endif
 
 #if ENABLED(HOST_ACTION_COMMANDS)