diff --git a/Makefile b/Makefile
index 1a5c359c4d2db55676023f96833bdc39fd96b789..1fbdf94540c3328139d756d4eb9ebf99f6f18725 100644
--- a/Makefile
+++ b/Makefile
@@ -12,6 +12,9 @@ test.o: test.c
 fx_s2308_double.o: fx_s2308_double.c 
 	$(CC) $(CFLAGS) fx_s2308_double.c
 
+fx_s2308_longlong.o: fx_s2308_longlong.c
+	$(CC) $(CFLAGS) fx_s2308_longlong.c
+
 clean:
 	- rm $(OBJS)
 	rm fx_s2308_double