diff --git a/sgsnemu/Makefile.am b/sgsnemu/Makefile.am
index b28cb04..ede1372 100644
--- a/sgsnemu/Makefile.am
+++ b/sgsnemu/Makefile.am
@@ -6,4 +6,4 @@
 
 sgsnemu_LDADD = @LIBOBJS@
 
-sgsnemu_SOURCES = sgsnemu.c tun.c tun.h cmdline.c cmdline.h ippool.h ippool.c syserr.h syserr.c
+sgsnemu_SOURCES = sgsnemu.c tun.c tun.h cmdline.c cmdline.h ippool.h ippool.c syserr.h syserr.c lookup.c