diff --git a/sdk/include/psdk/windef.h b/sdk/include/psdk/windef.h
index 386ec908695..bf6e6ff2127 100644
--- a/sdk/include/psdk/windef.h
+++ b/sdk/include/psdk/windef.h
@@ -90,6 +90,12 @@ typedef enum DPI_AWARENESS {
 #define DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 ((DPI_AWARENESS_CONTEXT)-4)
 #define DPI_AWARENESS_CONTEXT_UNAWARE_GDISCALED    ((DPI_AWARENESS_CONTEXT)-5)
 
+typedef enum DPI_HOSTING_BEHAVIOR {
+  DPI_HOSTING_BEHAVIOR_INVALID = -1,
+  DPI_HOSTING_BEHAVIOR_DEFAULT = 0,
+  DPI_HOSTING_BEHAVIOR_MIXED = 1
+} DPI_HOSTING_BEHAVIOR;
+
 typedef HICON HCURSOR;
 typedef DWORD COLORREF;
 typedef DWORD *LPCOLORREF;