diff --git a/openair3/NAS/COMMON/ESM/MSG/PduSessionEstablishmentAccept.h b/openair3/NAS/COMMON/ESM/MSG/PduSessionEstablishmentAccept.h
index 393d2cb4b6..757455f340 100644
--- a/openair3/NAS/COMMON/ESM/MSG/PduSessionEstablishmentAccept.h
+++ b/openair3/NAS/COMMON/ESM/MSG/PduSessionEstablishmentAccept.h
@@ -54,10 +54,6 @@
 #define ROC_MODIFY_QOS_RULE_WITHOUT_PF  0b110 /* Modify existing QoS rule without modifying packet filters */
 #define ROC_RESERVED_1                  0b111 /* Reserved */
 
-/* DNN - ASCII Codes */
-
-#define ASCII_ACK 0x06 /* Delimiter in the DNN IEI */
-
 /* DNN - APN 
  * TS 23.003 9.1
  * The APN is composed of two parts, the APN Network Identifier (9.1.1) & The APN Operator Identifier (9.1.2).