diff --git a/build/build_config.h b/build/build_config.h
index 57d41fb..b07660d 100644
--- a/build/build_config.h
+++ b/build/build_config.h
@@ -48,6 +48,7 @@
 #endif
 #elif defined(_WIN32)
 #define OS_WIN 1
+#define TOOLKIT_VIEWS 1
 #elif defined(__FreeBSD__)
 #define OS_FREEBSD 1
 #elif defined(__OpenBSD__)