diff --git a/spice/enums.h b/spice/enums.h
index d2dbfd0..802e1ee 100644
--- a/spice/enums.h
+++ b/spice/enums.h
@@ -415,6 +415,7 @@ enum {
     SPICE_MSG_DISPLAY_DRAW_ALPHA_BLEND,
     SPICE_MSG_DISPLAY_SURFACE_CREATE,
     SPICE_MSG_DISPLAY_SURFACE_DESTROY,
+    SPICE_MSG_DISPLAY_STREAM_DATA_SIZED,
 
     SPICE_MSG_END_DISPLAY
 };
diff --git a/spice/protocol.h b/spice/protocol.h
index e3342cb..ceba2a1 100644
--- a/spice/protocol.h
+++ b/spice/protocol.h
@@ -122,6 +122,10 @@ enum {
     SPICE_MAIN_CAP_NAME_AND_UUID,
 };
 
+enum {
+    SPICE_DISPLAY_CAP_SIZED_STREAM,
+};
+
 #include <spice/end-packed.h>
 
 #endif /* _H_SPICE_PROTOCOL */