diff --git a/Marlin/src/core/debug_out.h b/Marlin/src/core/debug_out.h
index 81e1e216b4..c43c928a29 100644
--- a/Marlin/src/core/debug_out.h
+++ b/Marlin/src/core/debug_out.h
@@ -26,6 +26,7 @@
 //  (or not) in a given .cpp file
 //
 
+#undef DEBUG_PRINT_P
 #undef DEBUG_ECHO_START
 #undef DEBUG_ERROR_START
 #undef DEBUG_CHAR