diff --git a/openair3/NAS/NR_UE/nr_nas_msg_sim.c b/openair3/NAS/NR_UE/nr_nas_msg_sim.c
index 2b2d9b08a5..378ca3d848 100644
--- a/openair3/NAS/NR_UE/nr_nas_msg_sim.c
+++ b/openair3/NAS/NR_UE/nr_nas_msg_sim.c
@@ -38,6 +38,7 @@
 #include "aka_functions.h"
 #include "secu_defs.h"
 #include "PduSessionEstablishRequest.h"
+#include "PduSessionEstablishmentAccept.h"
 #include "intertask_interface.h"
 #include "openair2/RRC/NAS/nas_config.h"
 #include <openair3/UICC/usim_interface.h>