diff --git a/src/encoding.cpp b/src/encoding.cpp
index e96894f..39cbe24 100644
--- a/src/encoding.cpp
+++ b/src/encoding.cpp
@@ -255,7 +255,9 @@
 		rc = write_alpha_gamma(dest, alpha, gamma);
 		check(rc);
 
-		set_0(dest); /* No TIMING_ADVANCE_INDEX */
+		rc = write_ta_index(dest, ta_idx);
+		check(rc);
+
 		set_0(dest); /* No TBF_STARTING_TIME */
 	} else {
 		set_0(dest); /* Single Block Allocation */
@@ -317,7 +319,9 @@
 		rc = write_alpha_gamma(dest, alpha, gamma);                 /* ALPHA and GAMMA */
 		check(rc);
 
-		set_0(dest);                                                /* No TIMING_ADVANCE_INDEX */
+		rc = write_ta_index(dest, ta_idx);
+		check(rc);
+
 		set_0(dest);                                                /* No TBF_STARTING_TIME */
 		bitvec_set_bit(dest, L);                                    /* No Additions for Rel-7 */
 	} else {