diff --git a/src/cas/example/directoryService/Makefile.Host b/src/cas/example/directoryService/Makefile.Host
index 3e50129fd..c79ebfd9d 100644
--- a/src/cas/example/directoryService/Makefile.Host
+++ b/src/cas/example/directoryService/Makefile.Host
@@ -7,6 +7,7 @@ include $(TOP)/config/CONFIG_BASE
 CXXCMPLR = STRICT
 
 PROD_LIBS := cas ca gdd Com
+SYS_PROD_LIBS_WIN32 := ws2_32
 
 SRCS += main.cc
 SRCS += directoryServer.cc