diff --git a/spice/qxl_windows.h b/spice/qxl_windows.h
index d1df684..bc2ceff 100644
--- a/spice/qxl_windows.h
+++ b/spice/qxl_windows.h
@@ -7,6 +7,7 @@
 
 enum {
     QXL_ESCAPE_SET_CUSTOM_DISPLAY = 0x10001,
+    QXL_ESCAPE_MONITOR_CONFIG
 };
 
 typedef struct SPICE_ATTR_PACKED QXLEscapeSetCustomDisplay {