diff --git a/src/win32/orconfig.h b/src/win32/orconfig.h
index cca73b0a30a3bf8312e0418024d01d57005b5e03..e7840954fd56c9072a4149b3b78c5a50d009c8e6 100644
--- a/src/win32/orconfig.h
+++ b/src/win32/orconfig.h
@@ -248,3 +248,4 @@
 #define FLEXIBLE_ARRAY_MEMBER 0
 #define HAVE_EVENT2_EVENT_H
 #define SHARE_DATADIR ""
+#define HAVE_EVENT2_DNS_H