diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index 2a147fb8c38..da41d5a12ec 100644
--- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
@@ -1232,7 +1232,7 @@ void brw_urb_WRITE(struct brw_compile *p,
 {
    struct brw_instruction *insn = next_insn(p, BRW_OPCODE_SEND);
 
-   assert(msg_length < 16);
+   assert(msg_length < BRW_MAX_MRF);
 
    brw_set_dest(insn, dest);
    brw_set_src0(insn, src0);