diff --git a/conf/firmwares/subsystems/fixedwing/intermcu_uart.makefile b/conf/firmwares/subsystems/fixedwing/intermcu_uart.makefile
index a904dfd32f..7bb2ce981b 100644
--- a/conf/firmwares/subsystems/fixedwing/intermcu_uart.makefile
+++ b/conf/firmwares/subsystems/fixedwing/intermcu_uart.makefile
@@ -8,16 +8,12 @@ $(error Using intermcu via UART, so dual mcu with separate fbw. Please add <conf
 endif
 
 ifeq ($(TARGET),fbw)
-  ifeq ($(INTERMCU_PORT),none)
-    INTERMCU_PORT = UART2
-    INTERMCU_PORT_LOWER = $(shell echo $(INTERMCU_PORT) | tr A-Z a-z)
-  endif
+  INTERMCU_PORT ?= UART2
+  INTERMCU_PORT_LOWER = $(shell echo $(INTERMCU_PORT) | tr A-Z a-z)
   fbw.CFLAGS += -DINTERMCU_LINK=$(INTERMCU_PORT_LOWER) -DUSE_$(INTERMCU_PORT) -D$(INTERMCU_PORT)_BAUD=B57600
 else
-  ifeq ($(INTERMCU_PORT),none)
-    INTERMCU_PORT = UART5
-    INTERMCU_PORT_LOWER = $(shell echo $(INTERMCU_PORT) | tr A-Z a-z)
-  endif
+  INTERMCU_PORT ?= UART5
+  INTERMCU_PORT_LOWER = $(shell echo $(INTERMCU_PORT) | tr A-Z a-z)
   ap.CFLAGS += -DINTERMCU_LINK=$(INTERMCU_PORT_LOWER) -DUSE_$(INTERMCU_PORT) -D$(INTERMCU_PORT)_BAUD=B57600
 endif