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-rw-r--r--widget/windows/TaskbarPreview.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/widget/windows/TaskbarPreview.cpp b/widget/windows/TaskbarPreview.cpp
index c897af021..6c15df2e0 100644
--- a/widget/windows/TaskbarPreview.cpp
+++ b/widget/windows/TaskbarPreview.cpp
@@ -28,7 +28,9 @@
#include "mozilla/Telemetry.h"
// Defined in dwmapi in a header that needs a higher numbered _WINNT #define
+#ifndef DWM_SIT_DISPLAYFRAME
#define DWM_SIT_DISPLAYFRAME 0x1
+#endif
namespace mozilla {
namespace widget {