diff --git a/boards/lobaro-lorabox/Makefile.include b/boards/lobaro-lorabox/Makefile.include
index b2bfe76781b79b6b7aedddfab59bc33186d34d22..45b63d68dd32e3284d609bdcaf5fecd720839943 100644
--- a/boards/lobaro-lorabox/Makefile.include
+++ b/boards/lobaro-lorabox/Makefile.include
@@ -21,6 +21,6 @@ HEXFILE = $(BINFILE)
 # -u: use sector by sector erase
 # -S: swap RTS and DTR
 # -l 0x1ff: amount of sectors to erase
-FFLAGS += -e -u -S -l 0x1ff -w $(BINFILE)
+FFLAGS += -p $(PORT) -e -u -S -l 0x1ff -w $(BINFILE)
 
 TERMFLAGS +=  --set-rts 0