diff --git a/Makefile b/Makefile
index 5934a7f2aba16ee0409cb72131865750bf276b15..1a5c359c4d2db55676023f96833bdc39fd96b789 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-SRC := test.c fx_s2308_double.c
+SRC := test.c fx_s2308_double.c fx_s2308_longlong.c
 OBJS := $(SRC:.c=.o)
 CC := gcc
 CFLAGS = -c -Wall -g