diff --git a/src/win.h b/src/win.h
index 009f073..0c3a223 100644
--- a/src/win.h
+++ b/src/win.h
@@ -10,7 +10,7 @@
 #pragma clang diagnostic ignored "-Wreserved-id-macro"
 #endif
 
-#if defined(_WIN32_WINNT)
+#ifdef _WIN32_WINNT
 #undef _WIN32_WINNT
 #endif