diff --git a/GNUmakefile b/GNUmakefile
index b491a57..426551b 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -263,7 +263,7 @@ socket_remote6.o: havesl.h
 
 dns_nd6.o fmt_xlong.o scan_xlong.o fmt_ip6_flat.o $(TEXTCODE_OBJS): haveinline.h
 
-iob_send.o scan_ip6if.c: havealloca.h
+iob_send.o scan_ip6if.o: havealloca.h
 
 dep: haveip6.h haven2i.h havesl.h haveinline.h iopause.h select.h haveepoll.h havekqueue.h havedevpoll.h
 	gcc -I. -MM */*.c t.c > dep
diff --git a/Makefile b/Makefile
index b5671e6..d33fb3a 100644
--- a/Makefile
+++ b/Makefile
@@ -692,7 +692,7 @@ socket_remote6.o: havesl.h
 
 dns_nd6.o fmt_xlong.o scan_xlong.o fmt_ip6_flat.o $(TEXTCODE_OBJS): haveinline.h
 
-iob_send.o scan_ip6if.c: havealloca.h
+iob_send.o scan_ip6if.o: havealloca.h
 
 dep: haveip6.h haven2i.h havesl.h haveinline.h iopause.h select.h haveepoll.h havekqueue.h havedevpoll.h
 	gcc -I. -MM */*.c t.c > dep