diff --git a/Marlin/src/core/serial.h b/Marlin/src/core/serial.h
index a5afb9d895..ee6c0e6eae 100644
--- a/Marlin/src/core/serial.h
+++ b/Marlin/src/core/serial.h
@@ -67,7 +67,7 @@ extern uint8_t marlin_debug_flags;
 // Serial redirection
 //
 // Step 1: Find out what the first serial leaf is
-#if BOTH(HAS_MULTI_SERIAL, SERIAL_CATCHALL)
+#if HAS_MULTI_SERIAL && defined(SERIAL_CATCHALL)
   #define _SERIAL_LEAF_1 MYSERIAL
 #else
   #define _SERIAL_LEAF_1 MYSERIAL1