diff --git a/spice/qxl_dev.h b/spice/qxl_dev.h
index 5e6ce06..7d21fa5 100644
--- a/spice/qxl_dev.h
+++ b/spice/qxl_dev.h
@@ -200,6 +200,7 @@ typedef struct SPICE_ATTR_PACKED QXLMemSlot {
 #define QXL_SURF_TYPE_PRIMARY      0
 
 #define QXL_SURF_FLAG_KEEP_DATA    (1 << 0)
+#define QXL_SURF_FLAG_GUEST_MEM    (1 << 1)
 
 typedef struct SPICE_ATTR_PACKED QXLSurfaceCreate {
     uint32_t width;