diff --git a/windows/runner/mpv/sdk_26100.h b/windows/runner/mpv/sdk_26100.h
index c9640aed..ececc142 100644
--- a/windows/runner/mpv/sdk_26100.h
+++ b/windows/runner/mpv/sdk_26100.h
@@ -7,6 +7,9 @@
 
 #include <Windows.h>
 
+// Only define these if the SDK doesn't already have them (SDK < 10.0.26100.0).
+#ifndef NTDDI_WIN11_GE
+
 enum {
   DISPLAYCONFIG_DEVICE_INFO_SET_RESERVED1 = 14,
   DISPLAYCONFIG_DEVICE_INFO_GET_ADVANCED_COLOR_INFO_2 = 15,
@@ -52,4 +55,6 @@ typedef struct _DISPLAYCONFIG_SET_HDR_STATE {
   };
 } DISPLAYCONFIG_SET_HDR_STATE;
 
+#endif  // NTDDI_WIN11_GE
+
 #endif  // SDK_26100_H_