diff --git a/lib/msp432/e4/Makefile b/lib/msp432/e4/Makefile
index d4a40a78..53d20f78 100644
--- a/lib/msp432/e4/Makefile
+++ b/lib/msp432/e4/Makefile
@@ -38,7 +38,8 @@ TGT_CFLAGS	+= $(STANDARD_FLAGS)
 # ARFLAGS	= rcsv
 ARFLAGS		= rcs
 
-OBJS		= systemcontrol.o gpio.o
+OBJS += gpio.o
+OBJS += systemcontrol.o
 
 VPATH += ../:../../cm3:../common