diff --git a/glxproto.h b/glxproto.h
index dfa0647..0ff44e3 100644
--- a/glxproto.h
+++ b/glxproto.h
@@ -1375,13 +1375,13 @@ typedef struct {
     BYTE pad;
     CARD16 sequenceNumber B16;
     CARD16 event_type B16;
-    CARD16 pad2;
     CARD32 drawable;
     CARD32 ust_hi B32;
     CARD32 ust_lo B32;
     CARD32 msc_hi B32;
     CARD32 msc_lo B32;
-    CARD32 sbc B32;
+    CARD32 sbc_hi B32;
+    CARD32 sbc_lo B32;
 } xGLXBufferSwapComplete;
 
 /************************************************************************/