diff --git a/src/mesa/vbo/vbo_split_copy.c b/src/mesa/vbo/vbo_split_copy.c
index 2ca111217ce..67291eaca60 100644
--- a/src/mesa/vbo/vbo_split_copy.c
+++ b/src/mesa/vbo/vbo_split_copy.c
@@ -196,7 +196,7 @@ flush( struct copy_context *copy )
 	       &copy->dstib,
 	       GL_TRUE,
 	       0,
-	       copy->dstbuf_nr );
+	       copy->dstbuf_nr - 1 );
 
    /* Reset all pointers: 
     */