diff --git a/thirdparty/oidn/common/platform.h b/thirdparty/oidn/common/platform.h
index 205ac8981d..9373b617b5 100644
--- a/thirdparty/oidn/common/platform.h
+++ b/thirdparty/oidn/common/platform.h
@@ -19,7 +19,7 @@
 #if defined(_WIN32)
   #define WIN32_LEAN_AND_MEAN
   #define NOMINMAX
-  #include <Windows.h>
+  #include <windows.h>
 #elif defined(__APPLE__)
   #include <sys/sysctl.h>
 #endif