diff --git a/tsk/tsk_config.h.in b/tsk/tsk_config.h.in
index 332929169f..5c6f7e0b7d 100644
--- a/tsk/tsk_config.h.in
+++ b/tsk/tsk_config.h.in
@@ -63,6 +63,9 @@
 /* Define to 1 if you have the <libewf.h> header file. */
 #undef HAVE_LIBEWF_H
 
+/* Define if using openssl */
+#undef HAVE_LIBOPENSSL
+
 /* Define to 1 if you have the `sqlite3' library (-lsqlite3). */
 #undef HAVE_LIBSQLITE3