diff --git a/boards/common/msba2/Makefile.include b/boards/common/msba2/Makefile.include
index 8b5342698e..e4cb2af037 100644
--- a/boards/common/msba2/Makefile.include
+++ b/boards/common/msba2/Makefile.include
@@ -16,7 +16,7 @@ PORT_LINUX ?= /dev/ttyUSB0
 # This does not make a lot of sense, but it has the same value as the previous code
 PORT_DARWIN ?= /dev/tty.usbserial-ARM
 
-TERMFLAGS += -tg -p "$(PORT)"
+PYTERMFLAGS += -tg
 include $(RIOTMAKE)/tools/serial.inc.mk
 
 export CFLAGS_CPU   = -mcpu=arm7tdmi-s
diff --git a/boards/lobaro-lorabox/Makefile.include b/boards/lobaro-lorabox/Makefile.include
index 136cf3034f..905d3d9e39 100644
--- a/boards/lobaro-lorabox/Makefile.include
+++ b/boards/lobaro-lorabox/Makefile.include
@@ -17,4 +17,4 @@ FLASHFILE ?= $(BINFILE)
 # -l 0x1ff: amount of sectors to erase
 FFLAGS += -p $(PORT) -e -u -S -l 0x1ff -w $(FLASHFILE)
 
-TERMFLAGS +=  --set-rts 0
+PYTERMFLAGS +=  --set-rts 0
diff --git a/makefiles/tools/serial.inc.mk b/makefiles/tools/serial.inc.mk
index 8abcf7fe1d..d18eb6fd90 100644
--- a/makefiles/tools/serial.inc.mk
+++ b/makefiles/tools/serial.inc.mk
@@ -15,7 +15,7 @@ export BAUD ?= 115200
 RIOT_TERMINAL ?= pyterm
 ifeq ($(RIOT_TERMINAL),pyterm)
   TERMPROG  ?= $(RIOTTOOLS)/pyterm/pyterm
-  TERMFLAGS ?= -p "$(PORT)" -b "$(BAUD)"
+  TERMFLAGS ?= -p "$(PORT)" -b "$(BAUD)" $(PYTERMFLAGS)
 else ifeq ($(RIOT_TERMINAL),socat)
   SOCAT_OUTPUT ?= -
   TERMPROG ?= $(RIOT_TERMINAL)