diff --git a/openair3/NAS/NR_UE/5GS/5GMM/MSG/fgmm_lib.c b/openair3/NAS/NR_UE/5GS/5GMM/MSG/fgmm_lib.c
index e21bc141c4..323cffe7e7 100644
--- a/openair3/NAS/NR_UE/5GS/5GMM/MSG/fgmm_lib.c
+++ b/openair3/NAS/NR_UE/5GS/5GMM/MSG/fgmm_lib.c
@@ -143,6 +143,14 @@ int decode_gprs_timer_ie(gprs_timer_t *timer, const byte_array_t *buffer)
   return decoded;
 }
 
+/** @brief Equality check for GPRS Timer */
+bool eq_gprs_timer(const gprs_timer_t *a, const gprs_timer_t *b)
+{
+ _NAS_EQ_CHECK_INT(a->value, b->value);
+ _NAS_EQ_CHECK_INT(a->unit, b->unit);
+  return true;
+}
+
 /* Decode EAP Message (todo) */
 int decode_eap_msg_ie(const byte_array_t *buffer)
 {
diff --git a/openair3/NAS/NR_UE/5GS/5GMM/MSG/fgmm_lib.h b/openair3/NAS/NR_UE/5GS/5GMM/MSG/fgmm_lib.h
index b09f19b828..4acf7368b5 100644
--- a/openair3/NAS/NR_UE/5GS/5GMM/MSG/fgmm_lib.h
+++ b/openair3/NAS/NR_UE/5GS/5GMM/MSG/fgmm_lib.h
@@ -161,6 +161,7 @@ int encode_pdu_session_ie(byte_array_t *buffer, nas_service_IEI_t iei, const uin
 int decode_pdu_session_ie(uint8_t *psi, const byte_array_t *buffer);
 int encode_gprs_timer_ie(byte_array_t *buffer, nas_service_IEI_t iei, const gprs_timer_t *timer);
 int decode_gprs_timer_ie(gprs_timer_t *timer, const byte_array_t *buffer);
+bool eq_gprs_timer(const gprs_timer_t *a, const gprs_timer_t *b);
 int decode_eap_msg_ie(const byte_array_t *buffer);
 
 #endif /* FGS_LIB_H */
\ No newline at end of file