diff --git a/trunk/src/or/Makefile.am b/trunk/src/or/Makefile.am
index e96b195c90..51b1427c31 100644
--- a/trunk/src/or/Makefile.am
+++ b/trunk/src/or/Makefile.am
@@ -5,7 +5,7 @@ noinst_PROGRAMS = test_config
 
 bin_PROGRAMS = or
 
-or_LDADD = -L../common -lor
+or_LDADD = -L../common -lor -lz
 
 or_SOURCES = buffers.c circuit.c command.c connection.c \
              connection_exit.c connection_ap.c connection_op.c connection_or.c config.c \