diff --git a/src/libcharon/Makefile.am b/src/libcharon/Makefile.am
index 586d1dd9a..a4f1ebbe3 100644
--- a/src/libcharon/Makefile.am
+++ b/src/libcharon/Makefile.am
@@ -144,6 +144,7 @@ libcharon_la_LIBADD = \
   -lm $(PTHREADLIB) $(DLLIB) $(SOCKLIB)
 
 if USE_WINDOWS
+  libcharon_la_LIBADD += -lws2_32
 else
   libcharon_la_SOURCES += \
     bus/listeners/sys_logger.c bus/listeners/sys_logger.h