diff --git a/src/library/tier1.c b/src/library/tier1.c
index 33f3171..6df259b 100755
--- a/src/library/tier1.c
+++ b/src/library/tier1.c
@@ -1488,7 +1488,7 @@ significance_propagation_dec_pass(bwc_coder *const coder, const int8 b)
                         {
                            stripe[k].bit[b] |= (bit << l);
 
-                           calc_xi(stripe, bit_mask, l, k, xi_h, xi_v, SIG2XI);
+                           calc_xi(stripe, bit_mask, k, l, xi_h, xi_v, SIG2XI);
 
                            stripe[k].xi |= ((XI2CONT[(xi_h << 2) | xi_v][1] ^ mq_bit_decode(coder->bitcoder, XI2CONT[(xi_h << 2) | xi_v][0])) << l);