diff --git a/src/mesa/drivers/dri/i965/brw_sf.c b/src/mesa/drivers/dri/i965/brw_sf.c
index 73232b3c7c8..a655b010fdb 100644
--- a/src/mesa/drivers/dri/i965/brw_sf.c
+++ b/src/mesa/drivers/dri/i965/brw_sf.c
@@ -43,7 +43,7 @@
 #include "brw_sf.h"
 #include "brw_state.h"
 
-#define DO_SETUP_BITS ((1<<FRAG_ATTRIB_MAX)-1)
+#define DO_SETUP_BITS ((1<<(FRAG_ATTRIB_MAX - MAX_VARYING))-1)
 
 static void compile_sf_prog( struct brw_context *brw,
 			     struct brw_sf_prog_key *key )