diff --git a/src/libtnccs/Makefile.am b/src/libtnccs/Makefile.am
index 22a3b93b0..7a630fe54 100644
--- a/src/libtnccs/Makefile.am
+++ b/src/libtnccs/Makefile.am
@@ -12,6 +12,10 @@ libtnccs_la_LIBADD = \
 	$(top_builddir)/src/libstrongswan/libstrongswan.la \
 	$(top_builddir)/src/libtncif/libtncif.la
 
+if USE_WINDOWS
+  libtnccs_la_LIBADD += -lws2_32
+endif
+
 libtnccs_la_SOURCES = \
 tnc/tnc.h tnc/tnc.c \
 tnc/imc/imc.h tnc/imc/imc_manager.h \
@@ -72,5 +76,3 @@ if MONOLITHIC
   libtnccs_la_LIBADD += plugins/tnccs_dynamic/libstrongswan-tnccs-dynamic.la
 endif
 endif
-
-