diff --git a/sys/dev/cxgbe/t4_sge.c b/sys/dev/cxgbe/t4_sge.c
index a1f6ec65935e..2b227194ff19 100644
--- a/sys/dev/cxgbe/t4_sge.c
+++ b/sys/dev/cxgbe/t4_sge.c
@@ -701,8 +701,10 @@ t4_tweak_chip_settings(struct adapter *sc)
 
 	KASSERT(nitems(sge_flbuf_sizes) <= SGE_FLBUF_SIZES,
 	    ("%s: hw buffer size table too big", __func__));
+	t4_write_reg(sc, A_SGE_FL_BUFFER_SIZE0, 4096);
+	t4_write_reg(sc, A_SGE_FL_BUFFER_SIZE1, 65536);
 	for (i = 0; i < min(nitems(sge_flbuf_sizes), SGE_FLBUF_SIZES); i++) {
-		t4_write_reg(sc, A_SGE_FL_BUFFER_SIZE0 + (4 * i),
+		t4_write_reg(sc, A_SGE_FL_BUFFER_SIZE15 - (4 * i),
 		    sge_flbuf_sizes[i]);
 	}