diff --git a/GNUmakefile b/GNUmakefile
index 9a06b04..68b4ef2 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -301,7 +301,7 @@ libsocket: trysocket.c
 socket_accept6.o socket_bind6.o socket_connect6.o socket_local6.o \
 socket_mchopcount6.o socket_mcjoin6.o socket_mcleave6.o socket_mcloop6.o \
 socket_recv6.o socket_remote6.o socket_sctp6b.o socket_send6.o \
-socket_tcp6b.o socket_udp6.o: haveip6.h
+socket_tcp6b.o socket_tcp6.o socket_udp6.o: haveip6.h
 
 socket_accept6.o socket_connect6.o socket_local6.o socket_recv6.o \
 socket_remote6.o socket_send6.o: havescope.h