diff --git a/lib/gtp/v1/message.c b/lib/gtp/v1/message.c
index 506b12579..785b47ef4 100644
--- a/lib/gtp/v1/message.c
+++ b/lib/gtp/v1/message.c
@@ -22,7 +22,7 @@
 /*******************************************************************************
  * This file had been created by gtp1-tlv.py script v0.1.0
  * Please do not modify this file but regenerate it via script.
- * Created on: 2023-12-11 17:18:23.055278 by pespin
+ * Created on: 2023-12-11 17:21:37.071241 by pespin
  * from 29060-h40.docx
  ******************************************************************************/
 
@@ -118,7 +118,7 @@ ogs_tlv_desc_t ogs_gtp1_tlv_desc_map_cause =
 
 ogs_tlv_desc_t ogs_gtp1_tlv_desc_p_tmsi_signature =
 {
-    OGS_TV_FIXED_STR,
+    OGS_TV_UINT24,
     "P-TMSI Signature",
     OGS_GTP1_P_TMSI_SIGNATURE_TYPE,
     3,
diff --git a/lib/gtp/v1/message.h b/lib/gtp/v1/message.h
index 743d91a69..901cac82d 100644
--- a/lib/gtp/v1/message.h
+++ b/lib/gtp/v1/message.h
@@ -22,7 +22,7 @@
 /*******************************************************************************
  * This file had been created by gtp1-tlv.py script v0.1.0
  * Please do not modify this file but regenerate it via script.
- * Created on: 2023-12-11 17:18:23.049626 by pespin
+ * Created on: 2023-12-11 17:21:37.064347 by pespin
  * from 29060-h40.docx
  ******************************************************************************/
 
@@ -469,7 +469,7 @@ typedef ogs_tlv_uint32_t ogs_gtp1_tlv_p_tmsi_t;
 typedef ogs_tlv_uint8_t ogs_gtp1_tlv_reordering_required_t;
 typedef ogs_tlv_octet_t ogs_gtp1_tlv_authentication_triplet_t;
 typedef ogs_tlv_octet_t ogs_gtp1_tlv_map_cause_t;
-typedef ogs_tlv_octet_t ogs_gtp1_tlv_p_tmsi_signature_t;
+typedef ogs_tlv_uint24_t ogs_gtp1_tlv_p_tmsi_signature_t;
 typedef ogs_tlv_uint8_t ogs_gtp1_tlv_ms_validated_t;
 typedef ogs_tlv_uint8_t ogs_gtp1_tlv_recovery_t;
 typedef ogs_tlv_uint8_t ogs_gtp1_tlv_selection_mode_t;
diff --git a/lib/gtp/v1/support/gtp1-tlv.py b/lib/gtp/v1/support/gtp1-tlv.py
index 42f6cd509..5ccbc4918 100644
--- a/lib/gtp/v1/support/gtp1-tlv.py
+++ b/lib/gtp/v1/support/gtp1-tlv.py
@@ -303,6 +303,7 @@ set_size("MS Time Zone", 2) # Wrongly specified as 1 in spec table
 set_c_type("Cause", 'uint')
 set_c_type("TLLI", 'uint')
 set_c_type("P-TMSI", 'uint')
+set_c_type("P-TMSI Signature", 'uint')
 set_c_type("MS Validated", 'uint')
 set_c_type("Recovery", 'uint')
 set_c_type("Tunnel Endpoint Identifier Data I", 'uint')