diff --git a/inc/dllmain.h b/inc/dllmain.h
index f23fef6..176d72a 100644
--- a/inc/dllmain.h
+++ b/inc/dllmain.h
@@ -16,12 +16,14 @@ typedef enum PROCESS_DPI_AWARENESS {
     PROCESS_PER_MONITOR_DPI_AWARE = 2
 } PROCESS_DPI_AWARENESS;
 
+#ifndef _DPI_AWARENESS_CONTEXTS_
 DECLARE_HANDLE(DPI_AWARENESS_CONTEXT);
 #define DPI_AWARENESS_CONTEXT_UNAWARE              ((DPI_AWARENESS_CONTEXT)-1)
 #define DPI_AWARENESS_CONTEXT_SYSTEM_AWARE         ((DPI_AWARENESS_CONTEXT)-2)
 #define DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE    ((DPI_AWARENESS_CONTEXT)-3)
 #define DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 ((DPI_AWARENESS_CONTEXT)-4)
 #define DPI_AWARENESS_CONTEXT_UNAWARE_GDISCALED    ((DPI_AWARENESS_CONTEXT)-5)
+#endif
 
 typedef HRESULT(__stdcall* SETPROCESSDPIAWERENESSPROC)(PROCESS_DPI_AWARENESS);
 typedef BOOL(__stdcall* SETPROCESSDPIAWAREPROC)();