diff --git a/src/gallium/drivers/d3d12/d3d12_format.h b/src/gallium/drivers/d3d12/d3d12_format.h
index 3f5054b4776..8d41d9271e3 100644
--- a/src/gallium/drivers/d3d12/d3d12_format.h
+++ b/src/gallium/drivers/d3d12/d3d12_format.h
@@ -26,7 +26,7 @@
 
 #include <directx/dxgiformat.h>
 #ifdef _WIN32
-#include <Windows.h>
+#include <windows.h>
 #else
 #include <wsl/winadapter.h>
 #endif