diff --git a/Makefile b/Makefile
index a3ea3dc..2507203 100644
--- a/Makefile
+++ b/Makefile
@@ -41,7 +41,7 @@ SRCS = iftop.c addr_hash.c hash.c ns_hash.c resolver.c ui.c util.c sorted_list.c
 HDRS = addr_hash.h hash.h iftop.h ns_hash.h resolver.h sorted_list.h ui.h options.h sll.h\
        serv_hash.h threadprof.h ether.h ip.h tcp.h
 TXTS = README CHANGES INSTALL TODO iftop.8 COPYING
-SPECFILE = iftop.spec
+SPECFILE = iftop.spec iftop.spec.in
 
 OBJS = $(SRCS:.c=.o)