diff --git a/Makefile b/Makefile
index 4e46665..2cd1a5c 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@ OBJS= main.o image.o dsp.o filter.o reg.o fcolor.o
 atpdec:	$(OBJS)
 	$(CC) -o $@ $(OBJS) -lm -lsndfile -lpng
 
-main.o:	main.c
+main.o:	main.c version.h
 dsp.o:	dsp.c filtercoeff.h filter.h
 filter.o: filter.c filter.h
 image.o: image.c satcal.h