--- tests/aeadtest.c.orig	2018-07-24 21:59:17.000000000 -0500
+++ tests/aeadtest.c	2018-11-07 18:44:43.000000000 -0600
@@ -76,6 +76,12 @@

 #define BUF_MAX 1024

+#ifdef _MSC_VER
+#ifdef IN
+#undef IN
+#endif
+#endif
+
 /* These are the different types of line that are found in the input file. */
 enum {
 	AEAD = 0,	/* name of the AEAD algorithm. */