diff --git a/makefiles/tools/bossa.inc.mk b/makefiles/tools/bossa.inc.mk
index 89aed6d8e30e2f447172ef19c1d27b56a43130d0..4951e38561019f0e6c1f8d99228747a395d44d7c 100644
--- a/makefiles/tools/bossa.inc.mk
+++ b/makefiles/tools/bossa.inc.mk
@@ -1,5 +1,5 @@
 export FLASHER ?= $(RIOTBASE)/dist/tools/bossa/bossac
-export FFLAGS  ?= -p $(PORT) -i -i -w -v -b -R $(HEXFILE)
+export FFLAGS  ?= -p $(PORT) -e -i -w -v -b -R $(HEXFILE)
 
 export OFLAGS  = -O binary
 export HEXFILE = $(ELFFILE:.elf=.bin)