diff --git a/tests/Makefile b/tests/Makefile
index 460858a..f25607b 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -13,6 +13,10 @@
 CFLAGS += -g3
 endif
 
+ifdef WINDOWS
+LDFLAGS += -lws2_32
+endif
+
 APPS =	test_suite_aes			test_suite_arc4			\
 		test_suite_base64		test_suite_camellia		\
 		test_suite_cipher.aes	test_suite_cipher.camellia	\