diff --git a/src/gallium/drivers/swr/rasterizer/common/os.h b/src/gallium/drivers/swr/rasterizer/common/os.h
index a52bc0e0db6..bda114d64e2 100644
--- a/src/gallium/drivers/swr/rasterizer/common/os.h
+++ b/src/gallium/drivers/swr/rasterizer/common/os.h
@@ -33,9 +33,11 @@
 #define SWR_VISIBLE __declspec(dllexport)
 
 #ifndef NOMINMAX
+#undef UNICODE
 #define NOMINMAX
 #include <windows.h>
 #undef NOMINMAX
+#define UNICODE
 #else
 #include <windows.h>
 #endif