--- a/src/mk/FreeBSD
+++ b/src/mk/FreeBSD
@@ -2,4 +2,4 @@
 include $(depth)/mk/localdefs
 
 ALL_CXXFLAGS = $(CXXFLAGS) $(COMMONCXXFLAGS) $(LOCALCXXFLAGS) -pthread 
-LIBSYS = -lz
+LIBSYS = -pthread -lz